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陈述句变为否定句1. 如果陈述句中有be动词(am , are, is, was, were),就在be动词后面直接加not。 I am a student. I am not a student. You are sad. You are not sad.She is a good girl. She is not a good girl.He is a good boy. He is not a good boy.Yesterday was Monday. Yesterday was not Monday.The students were busy yesterday. The students were not busy yesterday.2. 如果陈述句中有情态动词(can must should may will等),就在情态动词后面直接加not。 I can swim. I can not swim. You will go to the park. You will not go to the park.3. 如果陈述句中没有be动词也没有情态动词(就是实意动词),就需要借助助动词(do, does, did)来帮助否定。当句中的动词是原形时,加dont I like English. I do not like English. You have dinner. You do not have dinner.当句中的动词是第三人称单数时,加doesnt ,再加动词原形 She likes singing. She doesnt like singing. She does her homework. She does not do her homework. (特例)当句中的动词是过去式时,用didnt,加动词原形We had a great time during our holidays. We did not have a great time during our holidays. I went to school yesterday. I did not go to school yesterday.4、陈述句中的some在否定句中应改为any 如:There are some students in the cla

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