Which sentence correctly uses an apostrophe in a contraction where letters have been omitted from multiple words?
- The students could'nt understand why they would'nt be allowed to retake the examination.
- The students couldn't understand why they wouldn't be allowed to retake the examination. (correct answer)
- The students could'nt understand why they would not be allowed to retake the examination.
- The students couldn't understand why they would'nt be allowed to retake the examination.
Explanation: When you encounter questions about contractions, remember that apostrophes replace the exact letters that have been omitted when two words are combined. The key is knowing precisely which letters disappear in common contractions. Let's examine the two contractions in this question. "Could not" becomes "couldn't" by removing the "o" from "not" and replacing it with an apostrophe. Similarly, "would not" becomes "wouldn't" by removing the "o" from "not" and replacing it with an apostrophe. In both cases, the apostrophe goes between the "n" and the "t." Choice B correctly forms both contractions: "couldn't" and "wouldn't." The apostrophes are placed exactly where the omitted letters (the "o" in "not") would appear. Choice A incorrectly writes both contractions as "could'nt" and "would'nt." These place the apostrophe between the "d" and "n," which doesn't correspond to any omitted letters. No letters are removed from "could" or "would" when forming these contractions. Choice C uses the incorrect "could'nt" but then writes out "would not" completely, avoiding the second contraction altogether. While "would not" isn't wrong, it doesn't demonstrate proper contraction formation. Choice D mixes correct and incorrect forms, using "couldn't" properly but "would'nt" improperly. Study tip: When forming contractions, identify which specific letters disappear, then place the apostrophe in that exact spot. The most common error is misplacing the apostrophe rather than omitting it entirely. Practice with "not" contractions since they frequently appear on standardized tests.