兩者均可后接動名詞(不接不定式)，區(qū)別如下：　　
1. 表示反復(fù)發(fā)生的動作(即動作之間略有間隔)時，兩者可互換。如：　　
They kept (on) talking about it. 他們一直在談?wù)摯耸?。　?br /> My shoe laces keep (on) coming undone. 我的鞋帶老是松開?！　?br /> 2. 表示持續(xù)的狀態(tài)或連續(xù)不斷的動作(動作之間沒有間隔)時, 通常只用 keep doing sth。如：　　
He kept standing during the meeting. 開會時他一直站著?！　?br /> We kept hoping that they would have a chance to come to China some day. 我們一直希望他們什么時候有機(jī)會到中國來?！　?br /> 3. 表示將一直在做的事繼續(xù)做下去，通常只用 keep on doing。如：　　
He kept on working after dark. 天黑了他還繼續(xù)干?！　?br /> Don’t give up; keep on trying. 別灰心，繼續(xù)努力?！　?br /> 注：這樣的 keep on doing可與 go on doing 換用。如：　　
The boys kept [went] on doing their homework in spite of interruptions. 盡管有干擾，孩子們?nèi)岳^續(xù)做自己的作業(yè)。　　
4. 有時若意義明確，keep on 后的 doing sth 可省略，而 keep 后卻不能省略 doing sth。如：　　
The rain kept on for several days. 雨一連下了好幾天。　　


　　
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