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肯定句变否定句的规则肯定句改否定句的方法先观察句中是否有BE动词和情态动词,1、 如果有be动词,在be动词后加not即可。如:is not , are not , am not, was not, were not;2、 如果有情态动词,在can,should, will等后加not。如:cannot, should not, will not;3、 如果上述都没有的,在动词前加助动词否定形式dont/ doesnt/ didnt。注意:肯定句改成否定句时,some 改成any。练习把下面的句子变成否定句。1. She is watching TV now.2. We go to school on Sunday.3. His father works hard.4. Jacks mother is a nurse.5. The cat runs fast.6. They like reading books.7. My grandpa gives me a hot dog.8. Tom often walks to school.9. I have a doll.10. It is eating fish.