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A tricky question most of our students ask us is: "What do homework and fun have in common?"

Well, you see, one of the simplest mistakes to make on Sentence Correction questions in the GMAT is not to instantly spot incorrect subject-verb agreement. As you do better in your exam the questions will get a bit more tricky. You MUST memorize some nouns which are non-count in English, but which are often count in other languages. Here are a few: