陈述句变为否定句
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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。
①当句中的动词是原形时,加don’t
I like English. → I do not like English.
You have dinner. → You do not have dinner.
②当句中的动词是第三人称单数时,加doesn’t ,再加动词原形
She likes singing. →She doesn’t like singing.
She does her homework. → She does not do her homework. (特例)
③当句中的动词是过去式时,用didn’t,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 classroom.
There are not any students in the classroom.