A punctuation question with however in every choice tests where you end sentences and place the word. Cover the transition, the word that links ideas, then ask whether each side can stand alone. A transition can't join two full sentences, and a comma alone can't either. A semicolon separates full sentences, while a colon needs the second to explain the first. Use commas to set off however in the sentence where its meaning fits.
Hints
- Hint 1
Cover however and check whether each side can stand alone. Look for who or what each part is about and what it does or needs.
- Hint 2
Compare the words before and after the blank. Use the meaning of however to check how the need for a larger trial relates to the improvements.
Step-by-step
Cover, split, and test the meaning
Step 1Find the complete sentences
Cover however and read each side as a separate sentence; this question asks us to punctuate that word. Can each side stand alone? Before the blank, the study revealed significant improvements among patients, which tells us what the study found. After the blank, the words the findings still need to be replicated in a larger trial form a complete sentence about what the findings need. We have two complete sentences, not one interrupted sentence.
- Step 2
Check the sentence break
Can however join those full sentences by itself? A transition shows how ideas connect, but unlike a joining word such as but, it can't hold two sentences together. We need a mark that separates complete sentences. The version with no punctuation leaves no sentence break. The version with only a comma makes a comma splice, two full sentences joined incorrectly by a comma, even though however sits between them.
- Step 3
Place the transition by meaning
How does the findings still need to be replicated in a larger trial relate to the significant improvements? It adds a caution: the results look promising, but they still need further testing. So however, meaning despite that, belongs at the start of the second sentence. A colon needs what follows to explain or spell out the improvements, but this sentence limits what we can conclude from them. In patients; however,, the semicolon separates the sentences, and the comma sets off the opening transition. Choice B.