④ for表示的理由是附加的或推斷的，并非此原因，通常與主句用逗號隔開，不位于句首，如：

　　He must be not at home, for the telephone isn't answered.

　　用because, as, since, for 填空：

　　We'll have to go to bed early ___________ we'll start off early tomorrow.

　　___________ you know all about it, tell me please.

　　____________ all the seats were taken, I had to stand.

　　He must be at work, __________ the light in his office is still on.

　　Lily didn't go to school ___________ she was ill.

　　=_________________________________________________________.

　　(4) now that引導的原因狀語從句

　　Now that "因為;既然"，通常可以和since換用。用來表示一種新的情況，再加以推論。如：

　　Now(that) you have passed your test, you can drive on your own.

　　你既已考試合格，就可以獨自開車了。

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