to be doing和to have been (求助中……有这个用法吗?)to be doing 不是不定式表将来吗？

be said to be doing和be said to have been doing的区别 英语 have trouble+?be use to do 和 be use to doing区英语have trouble+?be use to do 和 be use to doing区别 Be said to do和be said to be doing和be said to have done有什么区别 to be doing 和 doing的区别 to be doing和to have done为什么不能作状语 用 be doing 和be doing to do 造句 三个 to be doing和to have been (求助中……有这个用法吗?)to be doing 不是不定式表将来吗？ 非谓语动词中什么时候用不定式,什么时候用分词,什么时候用动名词?不是区分to do,to be doing,to have done ,to be done ,to have been done!而是选项中同时出现to be doing和doing或to have done和having done或to have be close to doing. be reduced to doing happen to be doing pretend to be doing be happy to do sth和have a good time doing sth的区别 英语翻译have a good time doing sth 和be nice to sb（翻译成中文） to be done to have been done to have been doing 形式的造句, be used to doing 与 have got used to doing 有什么区别 They have every reason to be doing so.翻译 pretend to be done是什么时态?pretend to be doing pretend to have done pretend to have been done呢?