1,keep doing sth 一直坚持做某事
例子；I keep doing homework ,. 我一直坚持做作业
2,keep sb doing sth 让某人一直干某事
例子；His mother keeps him doing homework. 他妈妈让他一直做作业
3.keep sb from doing sth 阻止某人干某事
例子；She keeps him from talking .她不让他说话
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