3. as 引導原因狀語從句時表示附帶說明的“雙方已知的原因”，語氣比since弱，較為正式，位置較為靈活(常放于主句之前)。例如：As it is raining, you’d better take a taxi. 既然在下雨，你最好乘出租汽車。// As you are tired, you had better rest. 既然累了，你最好休息一下。// I went to bed early, as I was exhausted. 我睡得早，因為我筋疲力盡了。
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