keep on doing sth,继续做某事,有决心、坚持等主观意念在内.
keep doing sth,继续做某件事或某个动作,没有主观意念在内.
keep to do,没有这种用法,只有keep to sth,遵守或坚持某件事,如keep to one's promise.
保持做某事 只有keep on doing sth.有没有keep doing sth.或keep to do sth.
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Keep on doing sth和keep doing sth有什么区别
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keep sb doing sth 和keep sb to do sth 有什么区别啊
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语法：有没有keep sb do/to do sth?如果有,
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keep sth doing 与 keep sth done 有什么区别?
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insist on ,stick to (doing),keep at,keep doing sth,keep on d