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Sentence Correction Questions: Overview

In Sentence Correction questions, which type of mistake must always be corrected?

Good!

The correct answer choice to a Sentence Correction sentence will NEVER EVER include a grammatical mistake.

Actually, you're heading for big trouble if you prefer correcting stylistic mistakes to correcting grammatical ones. The correct answer to a Sentence Correction question can be stylistically flawed - it can be redundant or ambiguous - but it can NEVER be grammatically incorrect.

While stylistic mistakes don't always have to be corrected, and the correct answer can be stylistically imperfect, grammatical mistakes must always be corrected.

Thus, the correct answer is grammatical mistakes.

Incorrect. Grammatical mistakes indeed must always be corrected. Stylistic mistakes, on the other hand, must not always be corrected. We want to identify and correct them, but sometimes there just isn't a perfect answer choice: sometimes there are only grammatically correct but stylistically flawed answer choices and grammatically incorrect but stylistically correct answer choices.

In these cases, we'll choose grammatical correctness over style. The correct answer to a Sentence Correction question can be stylistically flawed - it can be redundant or ambiguous - but it can NEVER be grammatically incorrect.

Grammatical mistakes
Stylistic mistakes

I don't know

Both grammatical and stylistic mistakes