SAT inference questions: complete the text logically

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Difficulty: Advanced
Estimated time: 35 minutes
Practice: Inferences question bank

What you’ll learn

Recognize an inference question and read what its blank needs.
Put each clue before the blank in a few words, and join them.
Apply a rule the text states to the case it describes.
Predict the smallest conclusion the clues support.
Cross out choices that go too far, go past the text or turn it around.
Explain a puzzle, and say what a clue alone can't show.

Prerequisites

You’re ready. No earlier lesson is needed.

Why this matters on the SAT

The blank finishes the text’s own reasoning

An inference question gives you a short text that stops at a blank and asks: Which choice most logically completes the text? It's the most common question in Information and Ideas, about three in ten. The texts come from science, history and the arts. Texts that report a study, with groups compared or a hypothesis tested, get a lesson of their own. Everything the answer needs is in the sentences before the blank, so the question asks: what do these sentences add up to?

SAT example

On Gullstone Island, botanists had not recorded the blue dune lupine for eighteen years and had begun to consider its population there extinct. After a severe storm stripped away a thick mat of introduced beach grass, hundreds of lupine seedlings appeared in the same area, even though researchers found no adult lupines nearby. Seeds of related lupine species are known to remain viable beneath sand for decades and to germinate when light reaches them. Taken together, these observations suggest that ______

Which choice most logically completes the text?

A
the storm probably carried blue dune lupine seeds to Gullstone Island from a distant population.
B
adult lupines likely remained alive throughout the eighteen-year period but were concealed by beach grass.
C
blue dune lupine may have persisted on the island as buried seeds despite the absence of visible plants.
D
blue dune lupine seeds can germinate only after severe storms expose the sand to light.

Solution to the example

Clues: no lupine seen for eighteen years; hundreds of seedlings once the storm stripped the grass, with no adult plants nearby; related seeds wait in the sand for decades and sprout in light.

Predict: the lupine survived as buried seeds.

Cross out: A brings seeds from a distant population the text never mentions. B hides adult plants under the grass, but researchers found no adult lupines nearby.

Check: C says the lupine may have persisted on the island as buried seeds, which fits every clue, so the answer is C.

D tempts most: it follows the storm and the light, then adds only, a rule one storm can't show.

Put each clue in a few words, then predict the smallest conclusion

Every inference question uses the same routine:

Read what the blank needs: the words just before it ask for a conclusion, a prediction, a reason or a limit.
Put each clue in a few words.
Predict small: the smallest conclusion that fits every clue.
Cross out choices that go too far, go past the text or turn it around.
Check the last choice against every clue.

Step 1 is usually quick. The words right before the blank tell you what kind of ending it needs:

The words before the blank	The blank gives
suggests that, most likely indicates that, “so”, “therefore”	a conclusion, by far the most common
will likely, would most likely	a prediction
“because”, “since”	a reason
alone, by itself, on its own (sometimes only in the choices)	a limit: what the evidence can't show

Then the real work: put each clue in a few words, join them, and predict the smallest conclusion they support. Here's a short text of our own:

Rosa’s bakery

Rosa's bakery on Elm Street sold out of bread by nine last Saturday, hours earlier than usual. The week before, its only flour supplier had closed for repairs. It's likely that the bakery _____

Note: Clue 1: sold out hours early
Note: Clue 2: its only flour supplier was closed
Note: Predict: less flour, so less bread to sell that day

The prediction is small on purpose: one Saturday, one cause the text gives. The right choice may use other words, baked less bread than usual that day, or put the idea with a “not”: couldn't bake its usual amount of bread. Sometimes one earlier sentence already makes the point, and the blank only says it again in new words. Predict before you read the choices, then look for your idea, not your words.

Check your understanding:

Predict the blank in a few words. A plant on the north windowsill grew slowly all spring. Moved to the south window, which gets sun all afternoon, it doubled in size in a month. This suggests that _____

Try it on this question: put each clue in a few words and predict before you read the choices.

A new way to plan

Practice problem

Textile artist Marisol Vega once planned each wall hanging with a detailed drawing before touching the fabric. While preparing a recent series, however, she spread scraps of naturally dyed cloth across her studio floor and shifted them around until their colors and shapes seemed to balance. Vega said that this less planned process produced combinations she had not imagined beforehand. She used the same process for her next series, suggesting that ______

Which choice most logically completes the text?

When the text states a rule, apply it to the case

Many texts state a general rule first, then describe one case. The blank applies the rule to the case. Here's Rosa's bakery again, now with a rule:

Rosa’s bakery: a rule

Rosa bakes her rye bread only on days when her stone oven is working. Last Tuesday, the stone oven was out of service for repairs. So customers who came for rye bread that day most likely _____

Note: Rule: rye only when the stone oven works
Note: Case: the oven was out of service Tuesday
Note: Predict: no rye bread for them that day

A rule turns on its small words, and three of them come up again and again:

The rule says	What it means, at Rosa's
X “only when” Y	no Y, no X: rye only when the oven works, so oven down, no rye
“whenever” Y, X	Y brings X every time: whenever it rains, the patio closes
X “unless” Y	no Y means X, so no X means Y: she closes at two unless there's a fair, so if she's open at four, there's a fair

None of them runs in reverse: rye doesn't come every day the oven works, a closed patio doesn't mean rain, and a fair doesn't promise she stays open past two. A choice that runs a rule in reverse goes past it. In the text, only sets a rule to apply; in a choice, it's a claim to check, as the next section shows. Find the rule, find the case, and let the rule decide.

Check your understanding:

Apply the rule. The town library charges a fine only for books returned after their due date. Maya returned her book two days early, so she _____

This text gives two rules and one case. Find the rules, then apply them to the shards.

A hot kiln

Practice problem

At a hillside workshop excavation, archaeologists recovered shards of stoneware with glaze pitting that forms only when pottery is fired above about 1,200°C. Historical records indicate that kilns in this region typically reached 1,000–1,100°C unless operators used bellows to force additional air into the fire. Therefore, the kiln used at this workshop was likely ____

Which choice most logically completes the text?

Cross out choices that go too far, go past the text or turn it around

Most wrong choices on inference questions fail in one of three ways, and the first text about Rosa's bakery (it sold out hours early, the week after its only flour supplier closed) shows all three. Here are four ways to finish it:

Correct: Small enough: baked less bread than usual that day.
Wrong: Too far: will run out of bread every Saturday from now on.
Wrong: Past the text: makes better bread than the other bakeries on Elm Street.
Wrong: Turned around: had more flour than it could use.

Too far takes a true idea further than the clues reach: two clues about one Saturday can't carry a rule for every Saturday. Past the text brings in something the text never gives; nothing compares Rosa's bread with anyone else's. Turned around flips a clue: the supplier closed, so flour was short, not plentiful.

The answer is usually the smallest conclusion the clues support. Words like always, only, proves and must in a choice claim more than a few facts can show, so check them twice. Three more tips:

Right answers often hedge: may, likely, at least some, partly. But a hedge doesn't save a choice that goes past the text: in the opening question, A says probably and still goes.
The text's own words prove nothing: a choice can reuse them while its idea goes past the text.
If no prediction comes, test each choice against each clue and cross out.

Check your understanding:

Which ending goes too far? A city planted trees along one street, and that street was two degrees cooler the next summer. This suggests that _____ (1) the trees may have helped cool that street. (2) trees will cool any street in any city.

In this question, one choice goes much further than the clue can reach. Predict what the clue dates, and no more.

An acrylic top coat

Practice problem

While assessing an oil portrait long attributed to 1770, a conservator used spectroscopy to analyze the clear top coat covering the paint. The analysis identified the topmost varnish layer as an acrylic polymer first produced commercially in the 1930s; eighteenth-century varnishes were typically natural resins. Therefore, the conservator concluded that _____

Which choice most logically completes the text?

A puzzle: find what makes both facts true

Some texts set two facts against each other, with words like “yet”, “however”, “despite” or “even though”, and the blank explains how both can be true. The lead-in usually still says suggests that: the conclusion it asks for is what makes both facts true. Keep both facts, and look for the one idea that fits them together. Here's the first text about Rosa's bakery again, with a new second sentence and lead-in:

Rosa’s bakery: a puzzle

Rosa's bakery on Elm Street sold out of bread by nine last Saturday, hours earlier than usual. Yet it had baked more bread that day than ever before. This suggests that _____

Note: Fact 1: it sold out hours early
Note: Fact 2: it had baked more bread than ever
Note: Predict: customers wanted more bread than usual that morning

Correct: Fits both: customers wanted more bread than usual that morning.
Wrong: Denies a fact: it baked less bread than usual that day.
Wrong: Fits one fact only: its bakers started work earlier that morning.

Starting earlier fits the extra baking, but it doesn't explain the early sellout, so the puzzle is still there. And the ending that was right for the first text is wrong here: the new second sentence rules it out. A choice that explains only one fact leaves the puzzle unsolved.

In this question, two governments say one thing in public and do another in private. Keep both facts, then find what explains them together.

Tough talk, quiet deals

Practice problem

During a trade dispute, the governments of neighboring countries Bellora and Neris publicly insisted that they would make no concessions. However, records of private diplomatic meetings show that representatives from both countries had exchanged compromise proposals and agreed on a possible framework for an accord. At the time, both governments faced elections, and polls indicated that many voters viewed concessions as a sign of weakness. Soon after the elections, negotiations produced an accord resembling the earlier framework. These details suggest that the governments’ uncompromising public statements ______

Which choice most logically completes the text?

When another explanation fits, the clue alone can’t decide

Some texts give a clue, a claim about what caused it, and then a second way the same clue could have come about. When two explanations would leave the same clue, the clue alone can't choose between them. The blank then says what the clue can't show, often with alone, by itself or on its own.

Those words don't always come before the blank: the lead-in may say only “therefore”, and by itself turns up in a choice. So when a text gives a second explanation for its clue, expect a limit, whatever the lead-in says. Here's the first text about Rosa's bakery with a new ending:

Rosa’s bakery: a second explanation

Rosa's bakery on Elm Street sold out of bread by nine last Saturday, hours earlier than usual. Rosa credits her new rye recipe. But a street fair filled Elm Street that morning, and fairs draw crowds to every shop. So the early sellout, on its own, _____

Note: Claim: the new recipe drew the crowd
Note: Other explanation: the fair would have drawn a crowd anyway
Note: Predict: the sellout alone can't show that the recipe did it

Correct: A limit: doesn't show that the new recipe drew the customers.
Wrong: Too far: proves that the fair, not the recipe, drew the customers.
Wrong: Ignores the other explanation: shows that customers loved the new recipe.

The fair doesn't rule out the recipe; it only means the sellout could have happened either way. When either explanation fits the clue, the answer says the clue can't decide, not which one is right.

In this question, the text gives a find, one explanation for it, and then a second. Put each in a few words, then predict what the find alone can show.

A cluster of bones

Practice problem

During an excavation near a prehistoric riverbed, volunteers uncovered a tight cluster of large animal bones buried together. Some suggested that early humans had intentionally arranged the bones as part of a ritual. Lead archaeologist Dr. Moreno notes, however, that seasonal floods can carry bones into natural depressions and leave them piled together, and that similar clusters have been documented in areas with no evidence of human activity. The presence of the bone cluster at this site, therefore, _____

Which choice most logically completes the text?

Example: two findings, one small conclusion

In this question, two findings seem to pull against each other. Put each clue in a few words, then find the one conclusion that fits both.

Worked example

Archaeologists once argued that the residents of an ancient settlement located far inland would have eaten almost exclusively terrestrial plants and animals. Yet a recent analysis detected microscopic marine algae in residue on grinding stones from the site and in dental calculus from several buried individuals, even though earlier isotope studies of their bones had suggested only limited seafood consumption. Taken together, these findings most likely indicate that _____

Which choice most logically completes the text?

A
the inland community obtained marine foods at least occasionally, implying some form of contact with coastal environments.
B
the inland community depended on marine foods so heavily that earlier isotope studies should have shown a strong seafood signal.
C
the grinding stones must have been used only at coastal camps, meaning they cannot provide evidence about diet at the inland settlement.
D
the coastline must have been much closer to the settlement during the period in which the residents lived there.

Step 1

Read what the blank needs

The blank follows Taken together, these findings most likely indicate that. So it needs a conclusion that uses every finding at once, not just the newest one.

Step 2

Put the clues in a few words and predict

The old view: they ate almost exclusively terrestrial plants and animals. Then a turn, “Yet”: a new analysis detected microscopic marine algae on their grinding stones and teeth. But the bones push back: earlier tests of them suggested only limited seafood consumption.

Note: Clue 1: sea algae on their tools and teeth
Note: Clue 2: tests of their bones suggest only a little seafood
Note: Predict: they ate some food from the sea, but not much

Step 3

Cross out what goes too far or past the text

B is the most tempting, because it takes the new finding seriously. But depended on marine foods so heavily breaks Clue 2, the bones' small seafood signal: it goes too far. C and D account for the algae with facts the text never gives, tools used only at the coast and a coastline that moved, so they go past the text; C also ignores the algae on the buried people's teeth. B, C and D go.

Step 4

Check the last choice

A says at least occasionally, which fits both clues: some food from the sea, but not much. Food from the sea reaching a settlement far inland means some contact with coastal environments. The answer is A.

Example: a “however” that limits the conclusion

In this question, most of the evidence points one way, then “However” turns it. The answer has to keep both halves.

Worked example

Some scholars argue that novelist Mara Venn revised her 1894 serial "The Salt Lantern" chiefly to satisfy reviewers, citing differences between her outline and the published installments. Jae Okafor examined recently cataloged printer's proofs. Most changes—including a softened portrayal of a factory owner—appear in proofs dated weeks before any reviews were published. However, a reconciliation scene in the final installment is absent from a proof mailed three days before a review criticized the story's increasingly bleak direction. In a letter written the day after that review, Venn asked her editor to delay typesetting because she was "rethinking the final exchange." This evidence suggests that ______

Which choice most logically completes the text?

A
the reviews are unlikely to explain the novel's overall revision pattern, though one review may have contributed to the late addition of the reconciliation scene.
B
Venn likely drafted the reconciliation scene before the review appeared, and its absence from the surviving proof was merely a production oversight.
C
the early revisions probably arose from reviewers' private comments, while the published reviews simply repeated concerns that Venn had already addressed.
D
the printer's proofs rule out any reviewer influence, since they show that Venn had begun revising the novel before reviews were published.

Step 1

Read what the blank needs

The blank follows This evidence suggests that, so it needs a conclusion about the evidence: does it back the scholars' claim that Venn revised chiefly to satisfy reviewers?

Step 2

Put the clues in a few words and predict

Most changes appear in proofs dated weeks before any reviews were published. Then the turn, “However”: the reconciliation scene is absent from a proof mailed three days before a review criticized the story's bleak direction, and the day after that review, Venn asked her editor to delay typesetting.

Note: Clue 1: most changes came before any review
Note: Clue 2: the reconciliation scene wasn't there before the review, and Venn rethought the ending right after it
Note: Predict: reviews don't explain most changes, but one may explain the last scene

Step 3

Cross out what goes too far or past the text

The right answer has to fit both clues:

The answer needs	A	B	C	D
1. Reviews don't explain most changes	✓	silent	✗ invented	✓
2. One review may explain the last scene	✓	✗	✗	✗

D is the most tempting, because it follows Clue 1 and stops there. But rule out any reviewer influence skips the turn: Clue 2 shows a review may well have shaped the last scene, so D goes too far. B calls the missing scene a production oversight, which the text never suggests and Venn's letter argues against. C invents reviewers' private comments, past the text. B, C and D go.

Step 4

Check the last choice

A has two halves, one for each clue. The reviews are unlikely to explain the novel's overall revision pattern is Clue 1. Though one review may have contributed to the late addition of the reconciliation scene is Clue 2, and may have keeps it small. Both halves hold. The answer is A.

Practice problems

These questions mix the cases, so on each one, read what the blank needs, put the clues in a few words and predict before you read the choices.

A rain barrel

Practice problem

At a community garden, volunteers collect rainwater in a large barrel. An overflow pipe near the top of the barrel directs water into a small pond whenever the water rises above the pipe's opening. On Monday, the barrel was almost full. Several hours of heavy rain were forecast for Tuesday, and no one planned to remove water from the barrel before then. During Tuesday's rainfall, water will likely ______

Which choice most logically completes the text?

Sensors in the rehearsal room

Practice problem

Some contemporary dance companies use wearable sensors during technical rehearsals to detect subtle changes in balance and fatigue. Directors say the data help them adjust spacing, pacing, and rest so that dancers need fewer full-run rehearsals to arrive at a consistent performance. However, those same directors note that the sensors have done little to shorten the earlier period in which choreographers and dancers generate movement material through improvisation and conversation. This suggests that, for these companies, ______

Which choice most logically completes the text?

An early metro line

Practice problem

A hallmark of many modern urban rail systems is fully automated train operation, which can improve efficiency and safety. Using newly digitized engineering notes to reexamine an early prototype metro line, transportation historian Mara Chen found that the system used sensor-based signaling similar to that of later automated networks even though the trains still required a human driver to control speed and braking. The finding suggests that ____

Which choice most logically completes the text?

Finish the lesson

8 practice examples left

Finish the remaining questions correctly to complete this lesson.

Quick recap

Read what the blank needs: the words before it (or a second explanation in the text) ask for a conclusion, a prediction, a reason or a limit.
Clues in a few words: join them, and apply any rule the text states to its case.
Predict small: the smallest conclusion that fits every clue usually wins; cross out what goes too far, goes past the text or turns it around.
Puzzles and limits: the answer to a puzzle fits both facts, and when two explanations fit a clue, the clue alone can't decide.
Every question: read what the blank needs, put the clues in a few words, predict small, cross out, then check the last choice against every clue.

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