3　after和behind都可以表示“在……后面”

1　after 指次序的先后，表示的是动态，也表示在一点或一段时间之后，反义词是before 。

He came in after her. 他在她后面进来。

After you, please. 请先走。

I'll go over my notes after school. 放学后我将复习笔记。

She came back after three days. 她三天后回来了。

2　behind 指位置的前后，表示的是静态，反义词是in front of 。

There is a big tree behind the house. 房屋的后面有一棵大树。

The moon is behind a cloud. 月亮在云层后面。

She is standing behind him. 她站在他后面。

3　behind 还可以表示时间上的“迟于，晚于”，指“误了时间”。

The plane is twenty minutes behind time. 飞机晚点20分钟。

His ideas are behind the times. 他的思想落后于时代。

Jim was thirty minutes behind the appointment time. 吉姆比约会时间晚了30分钟。

4　behind 和after 都可以用作副词。

They walked behind . 他们在后面走。

He returned the book a month after . 他一个月后还了那本书。