1. keep back 落在后面,阻止,隐瞒,留下
eg: The police tried to keep the crowd back from the injured man. 警察试图挡住人群，不让他们靠近受伤的人。
He can keep nothing back from his friends. 他什么也瞒不住他的朋友。
The boss keeps back $50 a month towards my uniform. 老板每月扣我50美圆服装费。
2. keep down 卧下,镇压,控制,缩减,保留
eg: They are taking steps to keep down the rabbit population. 他们采取措施控制兔子的繁殖。
We must keep down expenses. 我们必须缩减开支。
I feel ill, doctor, and I can’t keep any food down. 我病了，医生，吃的东西都吐了。
3. keep in with 不断讨好，和……保持友谊
eg: She still keeps in with her former husband. 她仍和前夫保持友谊。
4. keep on 继续,留用，穿着...不脱
eg: The rain kept on for several days. 雨一连下了几天。
Don’t lose courage. Keep on trying. 别丧气，继续努力。
5. keep to 遵循，坚持，不离开
eg: He always keeps to his promises. 她总是说话算数的。
We kept to the roads we knew. 我们不离开我们认识的路。
6．Keep …to oneself 对 …守口如瓶
eg: He kept his conclusions to himself. 他对他的结论守口如瓶。
I’m resigning ---but keep it to yourself. 我要辞职了——但你不要传出去。
7． keep up(with) 不低落,维持,继续
eg: If this rain keeps up, the garden will be ruined.如果这雨继续下，花园就完蛋了。
It is difficult to keep on a conversation with a man who will only say Yes and no. 跟一个只会说“是、不是”的人很难谈下去。
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