keep up 是坚持的意思,keep doing sth也是坚持的意思.二者有什么区别么

keep up 是坚持的意思,keep doing sth也是坚持的意思.二者有什么区别么

keep up
坚持; 维持; 继续; 不低落; 不为(疾病等)所屈;坚持不懈
常用短语：
keep up with
跟上,不落后; 与...并肩前进
与...保持接触
keep it up
不松劲,照原样继续下去
keep one's end up
精神饱满地对付
keep up appearances
装门面
keep up appearance
【法】虚饰外表
keep up one's spirits
振作精神
keep up to date
使记到最近时期；使跟上时代
keep one's chin up
不气馁
例如：
The house is becoming too expensive for them to keep up.
他们的房子维修费用贵得越来越修不起了.
keep doing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.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?