请问keep on doing和 keep doing在用法上有什么区别?还有,当表示“继续做某事‘时,keep on

可互换,只是keepon更加强调时间的间隔性和动作的反复性,及某人做某事的决心。Hekeptonworkinguntilmidnightthoughhewastied。Theboykept/keptonaskingsomesillyquestionsinclass。2)若表示一连续不段的动作,或某一动作的持续状态,只宜用keepdoing。Shekeptwavingtoherhusbanduntilhewasoutofsight。Theykeptstandingoutsidetheroomduringallthemeeting。Keeplyinghere;Iwillbebacksoon。3)若表示今后或将来继续做某事,则只宜用keepondoing。Wemustkeeponworkinghardinthecomingnewyear。Hekeptonsmokingthoughweadvisedhimtostoptosmoke。goondoing,goontodo,goonwith这三个词组都表示“继续”的意思,但用法和含义上有差异。goondoing指做某一事情因故暂停,尚未做完,再“继续”做下去。它还可表示“一直做某事”。如：Althoughitwaslate,shewentonworking。虽然很晚了,她还继续工作着。Afterashortbreak,hewentonreadingthetext。暂停了一会儿后,他又接着读课文。Youshouldn'tgoonlivinginthisway!你总不能一直就这么生活下去。goontodo则表示某一件事已做完,再“接着”去做另一件事。如：Hewentontotalkabouttheworldsituation。他接着又谈了谈世界形势。Fathersaidmotherhadgonetothehospital,andwentontosaythatgrandmotherwascomingtotakecareofus。我现在可以继续做我的工作了吗?Pleasegoonwithyourstory。请继续讲你的故事。