专升本动词重点：
1， we could have finished our work 我们本可以完成我们的工作
2， We couldn't have played computer games for a long time 我们不可能玩游戏很久
3， We should have finished my work 我们本应该完成我们的工作
4， We ought to have finished our work 我们本应该完成我们的工作
5， We shouldn't have played computer games 我们本不应该玩电脑游戏
6， We oughtn't to have played computer games 我们本不应该玩电脑游戏
7， You need to do homework 你需要去做作业
8， You need read books， needn't you ？你需要读书，是么？
9， You needn't go if you don't want to 你不想去你就不必去了
， Must I read books？Yes，you must ，No，you needn't