For boundary questions, identify the finite verbs and determine whether the material on each side of the blank is an independent clause, a dependent clause, or a phrase. A semicolon requires independent clauses on both sides, whereas a colon can introduce an explanatory phrase or clause after a complete independent clause.
Hints
- Hint 1
Find the complete clause
Insert the word shared by all four choices, and determine whether the resulting text before the punctuation could stand alone as a sentence.
- Hint 2
Check the verb after the blank
Consider whether “beginning” functions as a finite verb that could make the following words an independent clause.
- Hint 3
Identify the relationship
Determine which boundary can introduce information that specifies the timing pattern described before the blank.
Step-by-step
- Step 1
Examine the first part
Because every choice supplies the word “pattern,” the text before the boundary forms an independent clause: “Her analysis revealed a consistent timing pattern.”
- Step 2
Examine the following structure
The words “the dawn chorus beginning earliest in parks beside highways and progressively later as road noise decreased” form a nonfinite clause because “beginning” is not a finite verb. This clause specifies what the timing pattern was.
- Step 3
Choose the appropriate boundary
A colon can follow a complete independent clause and introduce an explanatory clause or phrase. Therefore, pattern: the correctly completes the sentence.