as

[Carmenn]

''As''...a word with so many meanings... My question is : how do i know when is necessary to use it instead of ''because or ''while'' and the list countinues...? I suppose it most depends of each sentence, but how?

[Casiopea]

Carmenn, have a look here first, English Adverb Clauses - How to Use Adverb Clauses- Grammar for English ESL TEFL EFL ESOL.