happen 后边跟to do为什么不是to doing?happen为不及物动词 to应该是介词所以我认为应该是to doinghappen为不及物动词 to应该是介词所以我认为应该是happen to doing

happen 后边跟to do为什么不是to doing?happen为不及物动词 to应该是介词所以我认为应该是to doinghappen为不及物动词 to应该是介词所以我认为应该是happen to doing waste怎么用?后边跟不to do还是 doing happen to do和happen to be doing 的区别?顺便分别解释下.我问的是happen to be doing 不是happen to doing~ 问个关于happen的用法的问题.happen.不是happen to do sth.那么 碰巧去做,碰巧正做,和碰巧已做.是不是分别是happen to do,happen to doing,happen to have been? happen to do or happen doing? happen to do sth 中 happen 是不及物动词,为什么还能加不定式做宾语? （英语）关于happen When he got off the train,it happened ___________.A.to rainB.to be rainingC.rainingD.to raining我选了A不是说happen to do sth.这里为什么选B不选A呢? sb.happen to do sth. We must do everything possible to prevent such things from___againA.happening B.to happen C.happen选什么为什么? 用happen to do和happen to sb.造句 These things do happen 为什么用do what do you suppose _______to him?为什么是has happened不是to happen? I think cooking is for moms(think不是跟to do的吗）为什么? what do you think to happen there yesterday 中TO为什么Y要加? happen to do sth什么意思 chance/happen/seem/appear/pretend to do happen to do sth的汉语是什么? happen to do和happen to be doing有什么区别?区别是?HAPPEN TO BE DOING加的是进行时是吗?那是不是不能加结束性动词（短暂动词）了