Question

As, because and since are conjunctions. They introduce subordinate clauses.

All because, as, since and for are used to express reason. However, they are used differently.

 

Examples:

• He decided to go to the conference in Barcelona, as he was in Spain anyway.
• Are you angry with me because I opened the letter?
• Bilardo coaches his team by telephone, since half of them play in Italy, France or Spain.