15. why not do sth 为什么不做……呢？

　　why not go over your notebook？

　　为什么不复习一下笔记呢？

　　16. It's time to do sth. 到做某事的时间了

　　It's time to clean the classroom.

　　该打扫教室了。

　　17. sb. devote oneself/one's life to sth./doing.

　　致力于做某事

　　She devoted herself to teaching English.

　　她致力于教英语。

　　18. It is/ was+被强调部分+that/who…

　　It is this boy who broke the window.

　　是这个男孩打破了窗户。

　　19. I don't think/believee/suppose/expect+that

　　从句否定前移

　　I don’t think he will win the game.

　　我认为他不会赢得比赛。

　　20. would like to do 想要做某事

　　feel like doing 想要做某事

　　had better (not) do sth 最好（不）做某事        

　　would rather do 宁愿做……

　　I would like to drink some water.

　　我想喝水。

　　21. It is no use doing sth. 做某事没有用处

　　It is no use watching too much TV.

　　看太多电视是没用的。

　　22. 主语+have no idea+从句 不知道……

　　I have no idea when he will come back.

　　我不知道他什么时候回来。

　　23. no matter when/where/what/who/whether/how...

　　无论......

　　No matter who you are, you must obey the law.

　　无论你是谁，都必须遵守法律。

　　24. used to do 过去常常做某事

　　be used to doing 习惯于做某事

　　I used to make a joke on him.

　　我过去常常开他玩笑。

　　I have been used to getting up early.

　　我已经习惯了早起。

　　25. It is possible/probable/likely that…

　　可能……

　　It’s possible but not likely/probable that he’ll come here next month.

　　他下月有可能来这里，但是不是很肯定。