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keep back<-->keep on doing sth.
keep doing sth.
继续做某事
(1) 不断地或一直做某事(动作之间略有间隔)。如：
They kept talking about it.
他们一直在谈论此事。
My shoe laces keep coming undone.
我的鞋带老是松开。
注：此用法可与 keep on doing sth 换用。
(2) 一直在做某事(无间隔)。如：
He kept standing during the meeting.
开会时他一直站着。
He kept hoping that they would have chance to come to China some day. 我一直希望什么时候有机会到中国来。 注：此用法通常不能与 keep on doing sth 换
详解：keep doing sth．和keep on doing sth意义及用法相同，但后者更强调决心和重要性。如：
He kept coughing all morning．他整个上午不停地咳嗽。
He kept on phoning me, but I really didn’t want to talk to him．
他不断给我打电话，但我实在不想和他说话。
keep或keep on后跟表示动作的-ing形式，不可接动词不定式或表示静止状态的-ing形式，不能说He kept on to talk. 也不能说They kept on sitting.
keep back<-->keep on doing sth.
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