【6】 prevent sb. from doing sth.
(= stop/keep sb. from doing sth. )防止/阻止某人做……
在主动语态中,prevent/stop sb. from doing 中的from 可以省略,但是在被动语态中不可以省。keep sb. from doing sth. 中的from主动、被动语态中都不能省,因为keep sb. doing 意为“使某人不停地做某事”。
The heavy rain prevented/stopped her (from) going out. = The heavy rain kept her from going out.
→She was prevented from going out by the heavy rain.
大雨阻止了她出去。
As citizens, we should do what we can to prevent our river ______.
A. from polluted
B. from polluting
C. polluting
D. being polluted
D 句意:作为市民,我们应该尽力防止我们的河流被污染。A中from后要加being才对。“河流被污染”表被动,故选D。
【1】 By 27 BC, Rome had become an empire, which controlled many parts of Europe.
到公元前27年,罗马已经成为帝国,控制了欧洲的许多地区。
句子中有by +过去时间的时间状语或by the time +过去时的时间状语从句,谓语动词使用过去完成时。
By the time he was fourteen, Einstein had learned advanced mathematics all by himself.
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