16.can never/ can’t 与too, too much, enough, over- 搭配表示“无论怎样….都不过分”

　　1). While you are doing your homework, you can’t be careful enough.

　　2). He is such a great man that we can’t praise him too much.

　　3). William Hartley was handsome, determined and hardworking, in a word, I couldn’t speak too highly of him.

　　4). The development of society has made it necessary for us to have a good knowledge of English, so we can’t overemphasize the importance of learning English.

　　5). Since it is a good thing, we can’t do it too soon.

　　17. 不定式作主语，it作形势主语：

　　It +系动词+adj./ n..+ for sb. to do (for sb.表示动词不定式动作的执行者)

　　It +系动词+adj.+ of sb. to do (of sb.既表示动词不定式动作的执行者有表示人所具备的性质或特征)

　　1). It’s important for us to have a good knowledge of English.

　　2). How rude of him to treat a child like that!

　　3). It’s thoughtful of him to fix us up for the night.

　　18. 不定式作宾语，it作形势宾语：

　　主语+think/ consider/believe/ make/ feel+ it +adj./n. +for sb./ of sb. +to do

　　1). I feel it foolish of him to believe such a man.

　　2). The timely rain had made it possible for the crops to grow well.

　　19. won’t/ can’t have sb. doing/ done 不能容忍某行为发生

　　1). You are too rude, and I won’t have you speaking to Mother like that again.

　　2). We can’t have anything done against the school rules.

　　20. It is said/ thought/ hoped/ believed…..that……

　　Sb. is said/ thought/ hoped/ believed to do…..

　　1). It is said that he is studying abroad.--> He is said to be studying abroad.

　　2).It is considered that many countries highly value China’s role in helping world’s peace.

　　à Many countries is considered to highly value China’s role in helping world’s peace.