be become 和happen to有什么区别What will____the children if their sick father dies?为什么填be become of?

be become 和happen to有什么区别What will____the children if their sick father dies?为什么填be become of? happen to be doing become和to be 有什么区别? TO BE和Become的区别 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~ happen to和happen at的区别： happen with和happen to的区别 be 和 become 区别be susceptable to become susceptible to 都是容易受影响 ,请问区别是什么? be become的用法能用I want to be 和 I want to become是否相通的,都可以? 用happen to do和happen to sb.造句 become和be的区别? 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 l want to be和lwant become区别主语能直接跟be加动词吗 there happened to be 还是there happen to be把happen换成appear呢? some groups of people just happen to be fatter than others.happen to be什么结构 happen on 和 happen to 有什么区别正确. I want to be和I want to become是同义吗? 两个短语的区别want to be 和want to become 的区别.