Hello,<br/><br/>as/since/for all three are used in meaning <b>as result of or because of(</b> one of from the several usages).<br/><br/>for example.<br/><br/>As she was late, she missed the tarin.<br/><br/>Sine she was late, she missed the train.<br/><br/>She missed the train, for she was late.<br/><br/>How do I decide that which one (as,since,for) is appropriate?<br/><br/>Can any of you help me about the correct usage of all three for same meaning (<b>beacuse of).</b><br/><br/><b>Thanks.</b>