情态动词用法
四、在口语中，否定情态动词的缩写法：
1. cannot ---- can't
2. could not ---- couldn't
3. might not ---- mightn't
4. must not ---- mustn't
5. shall not ---- shan't
6. should not ---- shouldn't
7. will not ---- won't
8. would not ---- wouldn't
五、情态动词的否定疑问句：
将否定情态动词移到主语的前面，就成了否定疑问句。
1. Can she not work? 或 Can't she work ?
2. Would he not be working? 或 Wouldn't he be working ?
3. Should they not have worked? 或 Shouldn't they have worked ?
4. Could I not have been working? 或 Couldn't I have been working ?
六、情态动词的反问句：
1. She can work. 反问句：She can work, can't she?
2. He would be working. 反问句：He would be working, wouldn't he?
3. They should have worked. 反问句：They should have worked, shouldn't they?
4. I could have been working. 反问句：I could have been working, couldn't I?