Write negative sentences to the following. 6) My friend studies on Sunday.

To make a negative sentence in the Present Simple tense, we usually use "do not" or "does not" before the main verb. In this case, since the subject is "My friend" (third person singular), we use "does not". We also need to change "studies" back to its base form, "study". My friend does not study on Sunday. Ответ: My friend does not study on Sunday.