On doing sth

On doing sth spend on sth 等于spend doing sth 有spend.on doing sth work on doing sth造句? got an invitation to do sth 还是 on doing sth/in doing sth/of doing sth keep on doing sth与keep doing sth 的区别 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 work on doing sth还是work on to do sth? spend...on(in)doing sth.造句 spend st/sm on doing sth 造句 spend ...on(in) doing sth ---------------------------------------------的区别 用keep on doing sth 造句 用plan on doing sth造句 carry on doing sth句式是否正确 有没有keep sb on doing sth On the verge of doing sth the time spending on doing sth对吗 spend doing sth.和 spend on sth.有什么区别?