because
The reason is very important in the sentence,
.I read this book because I like it.
as
The reason is already known

.As we read, we learn.sinceThe reason is already known

SINCE IS MORE FORMAL THAN AS
(Since we were in the computer lab, our English has improved. sentence
The reason is given at the end of the sentence WITH FOR
.We went to a small restaurant - for we were hungry.

المصدر
http://www.englisch-hilfen.de/en/words/because_as_since_for.htm

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