stop.from(doing) sth=prevent.from(doing) sth=keep.from(doing) sth但stop和prevent后面的from可省略为什么keep后面的from不可省?

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stop.from(doing) sth=prevent.from(doing) sth=keep.from(doing) sth但stop和prevent后面的from可省略为什么keep后面的from不可省?
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stop.from(doing) sth=prevent.from(doing) sth=keep.from(doing) sth但stop和prevent后面的from可省略为什么keep后面的from不可省?
stop.from(doing) sth=prevent.from(doing) sth=keep.from(doing) sth
但stop和prevent后面的from可省略
为什么keep后面的from不可省?

stop.from(doing) sth=prevent.from(doing) sth=keep.from(doing) sth但stop和prevent后面的from可省略为什么keep后面的from不可省?
因为 stop sb.(from) doing sth 和 prevent sb (from) doing sth 省掉了from 不会影响语义,而 keep sb.from doing sth 省掉from后,意思正好相反：
I kept him working on his homework —— 我一直让他做作业
I kept him from working on his homework —— 我不让他做作业

keep doing 表示一直在做，加了from 才能表示prevent的意思

因为如果keep sb from doing sth......省掉之后变成keep sb doing sth意思变为“使某人一直做某事”。所以不能省

keep后面from省略后就变成另外一个意思，只有在keep from doing sth 时才有阻止做某事的意思，而keep doing sth 就是一直做某事的意思，所以keep后面from不可省略。

stop sth from doing stop from doing sth stop...from doing sth造句 be stop from doing sth stop sb from doing stop sb doing sth区别要纯手打! stop sb from doing sth 是什么意思? stop sb. from doing sth.等于什么 造句run away stop from doing sth prevent keep sb/stop/sth from sth doing sth造句 stop sb能等于stop sb from doing sth? stop sb.from doing sth.后面是不是接doing/ keep sb.from doing sth.和stop sb.from doing sth.中哪个from可以省略 stop sb from doing sth 中from可以省略吗 stop doing sth和stop from doing sth 有什么区别?一般怎么用? stop doing sth和stop from doing sth 有什么区别?一般怎么用 用there is sb /sth doing sth,stop sb (from) doing sth造句 (keep sb.from doing sth.) (be stopped from doing sth.)和(stop doing sth.) 有什么区别,详例, Stop sb.from ...三者区别.Stop sb.from doing sth.Prevent sb.from doing sth.Protect sb.from doing sth.请问三者区别是什么,请各举一例~