課本中不會教你的[K]423　keep sb./sth. from doing sth.和keep sb. doing sth.

423　keep sb./sth. from doing sth.和keep sb. doing sth.

① “阻止，制止，防止某人或某物做某事”有一種固定結(jié)構(gòu)：

keep sb./sth. from doing sth.

prevent sb./sth. from doing sth.

stop sb./sth. from doing sth.

② keep sb./sth. from doing sth.中的from不可省略，如果省去from，則為keep sb./sth. doing sth.，表示“使某人一直做某事，讓某人持續(xù)做某事”，這種用法的keep可用have代替。

The heavy rain kept us from going out. 大雨使我們不能出去。

She could hardly keep herself from crying. 她無法控制自己不哭。

He kept us waiting for over an hour. 他讓我們等了一個多小時。

She kept them laughing all the way. 她使他們笑了一路。

I'm sorry to have kept you waiting so long. 很抱歉讓你們久等了。

③ prevent/stop sb./sth. from doing sth.中的from可以省略，意思不變，但在被動語態(tài)中不可省略。

Nothing can prevent him（from）doing that. 沒有任何東西能阻止他做那件事。

You have to prevent such a thing（from）happening again. 你應該防止這樣的事再發(fā)生。

Such a thing has to be prevented from happening again. 這樣的事應該阻止再發(fā)生。

You should stop him（from）smoking. 你應該阻止他抽煙。

He should be stopped from smoking. 他應該被阻止抽煙。