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詞語辨析:keep與keep on的用法區別
兩者均可后接動名詞(不接不定式)，區別如下：
1. 表示反復發生的動作(即動作之間略有間隔)時，兩者可互換。如：
They kept (on) talking about it. 他們一直在談論此事�！ �
My shoe laces keep (on) coming undone. 我的鞋帶老是松開�！ �
2. 表示持續的狀態或連續不斷的動作(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�！ �
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會到中國來�！ �
3. 表示將一直在做的事繼續做下去，通常只用 keep on doing。如：
He kept on working after dark. 天黑了他還繼續干�！ �
Don’t give up; keep on trying. 別灰心，繼續努力�！ �
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，孩子們仍繼續做自己的作業�！ �
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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