keep on doing sth和keep doing sth的区别：keep on doing sth表示动作的反复，强调动作与动作之间有间隔；而keep doing sth强调状态的继续，常与表示延续性动作的动词和静止状态的动词连用。
一、keep on doing sth的用法及含义
keep on doing sth，表示动作的反复，强调动作与动作之间有间隔。
例句：There are some things we just have to keep on doing.
总有一些事情，我们不得不持续地去做。
We must keep on doing so.
我们今后还要这样做。
Keep on doing what you are doing.
继续做你现在正在做的事情。
I can keep on doing whatever I desire.
我可以继续为所欲为了。
And then the plastids keep on doing what they do, which is convert sunlight to usable energy.
然后这些叶绿体继续它们的本职工作&将阳光转化为可用的能量。
Don't keep ( on) doing such foolish things.
不要老是做这样的傻事。
You ought to keep you mind on what you are doing.
你应该专心致志的做你的工作。
二、keep doing sth的用法及含义
keep doing sth，意为继续做什么，强调状态的继续，常与表示延续性动作的动词和静止状态的动词连用。
例句：I've got to keep doing this kind of thing.
我必须继续做这种事。
The important thing is to know what to do and then just keep doing it.
重要的是要知道该做什么，然后坚持下去。
I hope you will keep from doing anything rash.
我希望你克制自己不去做任何鲁莽的事。
No one would like to keep doing something he doesn't like.
没人愿意一直做自己不喜欢的事情。
I may not be able to keep doing this for long.
我不能总像这样下去。
