keep短语与固定搭配
1 . keep at sth 坚持做某事。如：
Keep at it. 坚持做。
He kept at the job until finished. 他坚持把工作干完。
2 . keep doing sth
不断地或一直做某事。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。
一直在做某事。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 换用。
3 . keep on doing sth
不断地或一直做某事。如：
He kept on looking at us. 他老是瞧我们。
Don’t keep on asking questions like that. 不要老是问那样的问题。
注：此用法可与 keep doing sth 换用。
继续做某事。如：
He kept on working after dark. 天黑了我们还继续干。
Don’t give up; keep on trying. 别灰心，继续努力。
注：这样的 keep on doing 有时可与 go on doing 换用。如：
The boys kept [went] on doing their homework in spite of interruptions. 尽管有干扰，孩子们仍继续做自己的作业。
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