because, as, since or for

Word

Explanation

Example

Because

The reason is very important in the sentence, so because comes in the sencond clause of the sentence.

I read this book because I  like it

as

The reason is already known

As we read, we learn.

since

The reason is already known.
(more formal than as )

Since we were in the computer lab, our English has improved.

for

The reason is given at the end of the sentence.

We went to a small restaurant - for we were hungry.