be to do sth.和be about to do sth.有什么区别?

be surprised at sth.和be surprised to do sth. be to do sth和will do sth的区别 区分一下sth be supposed to do和sth be supposed to be done 用be eager to do sth.和be willing to do sth.造句 be consided to do sth 和be supposed to do sth 有什么区别 be to do sth.和be about to do sth.有什么区别? be to do sth.和will do sth.和be about to do sth.有什么不同? be sure to do sth. be pleased to do sth be able to do sth be going to do sth be let to do sth? be sad to do sth. be made to do sth be obliged to do sth. be used to do sth. will do sth, be about to do sth, be to do sth, be going to do sth 和be doing 的区别will do sth, be about to do sth, be to do sth, be going to do sth 和be doing 的详细用法及它们之间的区别 sb be seen to do sth 和 sb be seen do sth 有什么不同?