keep的过去式是kept。
keep是一个常用英语单词，既可以做及物动词也可以做不及物动词。
v.保持;(使)处于;继续(做某事);使耽搁
n.生活必需品;生活费用;城堡主楼
第三人称单数：keeps;复数：keeps;现在分词：keeping;过去式：kept;过去分词：kept。
双语例句：
1.I go swimming every day in order to keep fit.
我每天游泳以保持健康。
2.You'll need to keep a clear head for your interview.
你面试时需要保持清醒的头脑。
3.I said I'd go just to keep him happy.
我说过我要去只是为了让他高兴。
4.It is important to keep in touch with the latest research.
及时掌握最新研究情况很重要。
5.Keep going like that ─ you're doing fine.
就这样做下去——你做得蛮不错嘛。
