They can swim. -> They cannot swim.
She may bring her dog. -> She may not bring her dog.
He should help you. -> He should not help you.
They must finish their homework. -> They must not finish their homework.
助动词改为否定句的题目
以下是一些将助动词改为否定句的题目：
1. Does she like ice cream?
2. Can they swim?
3. Has he finished his homework?
4. Did you enjoy the party?
5. Will it rain tomorrow?
6. Should we go to the park?
7. Must they leave now?
8. Could you lend me your phone?
9. Would he like to come with us?
10. Were they playing football in the park?
助动词改为否定句的题目
有助动词，变否定句在助动词后加not.