谁能帮我讲讲use to do use to doing used to do 的用法?return 的用法?

谁能帮我讲讲use to do use to doing used to do 的用法?return 的用法? use to do use to do 翻译 use to do sth等于 “use to do sth”用法 use to do和use to be的区别 use to do和use to doing 的区别 use sth to do sth =use sth for doing use to do和use doing区别中文 use sth doing sth还是use sth to do sth use to do ,be use to doing,be use far用法? 请问一下use的用法以及use to do 和use to doing的区别等 use to和use for用法相同吗?可不可以说use for doing=use to do use to do sth等于什么词组 use to do sth.造句 配中英文, what do dolphins use to find things? use to do sth.造句 配中英文, use后加to do sth