如题所述
prevent sb from doing sth的from在主动语态中可以省略，但在被动语态中不可省。
例句：
1)Don't prevent him playing basketball.不要阻止他打篮球。
2)He was prevented from playing basketball.有人阻止他打篮球。
3)Something or other prevented him （from） coming . 不知什么事使他不能来。
例句：
1)Don't prevent him playing basketball.不要阻止他打篮球。
2)He was prevented from playing basketball.有人阻止他打篮球。
3)Something or other prevented him （from） coming . 不知什么事使他不能来。
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