notice,hold,没有被动态吗?be noticed to do sth./doing sth.和be held不
be allowed to do sth等于allow doing sth吗?
be afraid to do sth和be afraid doing sth的意思相同吗?区别是什么
be used for doing sth和be used to do sth一样吗?
be glad to do sth 还是be glad doing sth
be afraid to do sth be afraid of doing sth
be scared to do sth还是be scared doing sth
be heard to do sth 还是 be heard doing sth?
be worth to do sth 还是be worth doing sth
be afeaid to do sth和be afraid of sth和be afraid of doing sth的
be crazy about doing sth 和be crazy to do sth的区别是什么
be easy to do sth 和 be easy doing sth有什么区别
be sure to do sth和be sure of doing sth的区别