use to后面加什么形式

There's a cheat you can use to get to the next level.

有种秘技，你可以用来到达下一关。

Philosophers did not use to make a distinction between arts and science.

哲学家过去习惯不把艺术和科学区别开来。

I didn't use to like opera but my husband has converted me.

我过去不喜欢歌剧，但我丈夫改变了我。

I'm sorry, I've been no use to you.

对不起，我一点儿忙也没帮上。

The contents of this booklet should be of use to all students

这本小册子的内容应该会对所有的学生都有用处。