hold on to doing sth 还是hold on to do sth

hold on to do sth 还是hold on to doing sth hold on to do sth 还是hold on to doing sth hold on to doing sth 还是hold on to do sth 坚持做某事,是hold on to do sth.还是 hold on to doing sth.有何区别? hold on to sth hold up to hold on to do sth hold on to doing sth ,哪个对look forward to doing 这里又怎么搞的 英语翻译2,be willing to do ,would like to do sth,愿意做某事可以是同义词组吗,3hold on to do sth,continute doing sth,go on doing sth,是同义词组吗,可以通用吗, got an invitation to do sth 还是 on doing sth/in doing sth/of doing sth work on doing sth还是work on to do sth? 13,appreciate doing sth 14,catch sb doing sth 15,consider doing sth 16,devote to doing sth 17,keep...doing sth 和 keep on doing sth live on 后接doing sth 还是to do sth? hold on to doing 中的to能不能省略? go on to do sth ,go on doing sth,go on with sth有什么区别 go on doing sth,go on to do sth,continue doing sth,continue to do sth,keep doing sth它们有什么区别 坚持做某事是hold on to doing going on doing sth go on to do On doing sth spend doing sth和spend on sthspend doing sth等于spend on it takes sb some time to do sth 等于 spend doing sth 、 spend on why?