حروف الجر والروابط الزمنية :before - after - as - as soon as

Prepositions and Conjunctions of Time - before / after / as / as soon as

Before

Before is used for something that occurs before a certain time. For example

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

Note that when a preposition is followed by a verb, the verb ends in ing. So for example

Where did you live before coming to America? Correct

Where did you live before to come to America? Incorrect

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After is used for something that occurs after a certain time. For example

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 is used when two shorter actions happen together. For example

I dropped my keys as I left my apartment

As is also used when two longer actions happen together. For example

His health improved as he exercised more

As time went by his English got better

As is also used when an action happens during a background situation

I woke up as the sun was rising

She arrived as you were leaving

As - Reason

As is often used to show one thing is the cause of another, like the word "because". For example

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 is used when something happens immediately after something else. For example

I'll give you a call as soon as I'm finished

As soon as they go out let's eat lunch

We'll send payment as soon as you fax the signed contract

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