You use after to say that something happens at a later time than something else.
1. Eva was tidying up after lunch.
2. Send them on their way after just one meal.
If you are behind someone or something, they are in front of you and you are facing their back.
3. Alison came across and stood behind her.
4. The girl behind him is typing.
5. Sandy stared at me, his eyes widening behind his rimless glasses.
After and behind can also be used with verbs such as ‘walk* or ‘run’ which express movement. If you walk or run behind someone, they are in front of you and stay in front of you.
6. He walked behind me for a long way.
If you walk or run after someone, you try to reach where they are, perhaps so you can talk to them or in order to catch them.
7. Thomas ran after him, yelling to him to stop.