keep on trying 与 keep trying 的区别

问题描述:

keep on trying 与 keep trying 的区别
请问 keep on trying 与 keep trying 的具体区别,

keep doing,keep on doing这两个词组均用来表示“不断做”的意思,但在涵义上有所不同.
keep doing和keep on doing都可表示“不断(老是)做某事”的意思,强调动作连续不断,每隔一会儿发生,这时两者可以换用.不同的是keep doing中的doing是动名词,作宾语.例如:John always kept (on) asking questions.约翰总是问个不停.News of successes keeps (on) pouring in.捷报频传.
keep doing还可表示连续不断的动作或持续的状态.keep on doing则没有这种用法.例如:We kept working in the fields in spite of the rain.尽管下雨,我们还是坚持在地里干活.Why do the dogs keep barking?这些狗为什么不停地叫?
keep up:
坚持不懈
.