原因状语从句的引导词通常表示“因为”或语气稍弱的“既然，由于，鉴于”等，常用的有8个，欢迎补充。
1. because 因为
例：John didn’t attend the meeting because he was ill.
2. since 既然，由于，是，因为
例：Since it is late I shall go home now.
3. as 因为
例：As the weather is so bad, we have to delay our journey.
4. now that ，既然，因为
例：Now that you are grown up, you should not rely on your parents.
