The main thing to remember here is the third person singular, which adds an -s/-es in the affirmative, and does/doesn't in the interrogative and negative forms. A typical mistake is to keep the -s/-es in the interrogative or negative form. *Does he reads a lot? That is not correct. If the -s/-es is somewhat in the auxiliary verb, we do not repeat it in the main verb: Does he read a lot?


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