Before

Before est utilisé pour dire que quelque chose se produit avant un certain temps.

- We should finish this exercise before 4.00.
- I need to buy a present before James comes.
- Before starting any business, it's a good idea to write a business plan.

Noter que lorsque une préposition est suivi d'un verbe, celui-ci se termine en -ing.

- Where did you live before coming to America? Correct
- Where did you live before to come to America? Incorrect

After

After est utilisé pour dire que quelque chose se produit après un certain temps, après autre chose.  

- I'll see you after work.
- Camilla won't be home until after midnight.
- David got promoted after just two years with the company.

As - Time

As est utilisé lorsque deux actions se font simultanément..

- I dropped my keys as I left my apartment.
- His health improved as he exercised more.
- As time went by his English got better.

As est aussi utilisé lorsqu'une action est faite juste à la fin d'une autre.

.
- I woke up as the sun was rising.
- She arrived as you were leaving.

As - Reason

As est souvent utilisé pour montrer qu'une action est la cause d'une autre. 

- I'm going to bed early as I have to get up early tomorrow.
- As we're not busy, let's meet this afternoon for lunch.

As soon as

As soon as est utilisé quand quelque chose arrive aussitôt qu'une action est faite.

- I'll give you a call as soon as I have finished.
- As soon as they go out let's eat lunch.
- We'll send payment as soon as you fax the signed contract.

           Exercice : Ecrire la proposition correcte .

Intermediate
English exercise "Before, after, as, as soon as" created by anonyme (16-09-2005) with The test builder
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1. 1. You will not be hungry you eat. (after - before)
2. the sun set, the shadows lengthened. (After - As)
3. Every night, brushing my teeth, I go to bed. (after - before)
4. the girl fell asleep, she had a strange dream. (After- Before)
5. I was building a fire, smoke kept getting in my eyes. (As - Before)
6. I want to graduate from high school possible. (after - as soon as)
7. he started the car, the engine made a strange sound. (As - Before)
8. You have to pack your suitcase you go to the airport. (after - before)
9. Just I was picking up my glasses, they fell out of my hand. (as - before)
10. I get my driver's license, I'm going to drive to your house. (As soon as - Before)