Learn how non-native English speakers and native speakers miss the point of preparing for the GMAT Sentence Correction questions.
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Non-native English speakers think that their main problem is grammar, whereas native English speakers think that being a native speaker is an advantage. They are both wrong! The reason is this: usually, non-native English speakers stick to the rules, missing the fact that around a third of the questions can be solved logically, and another third by eliminating the obviously-wrong answers. Native speakers, on the other hand, tend not to memorize the rules at all. They try to FEEL, intuitively, what sounds right. This way, they miss the more complex questions, where the wrong answers sound right. The tip for all of you - improve the complete set of tools, not just the tools within your comfort zone.