初中英语状语从句要点：缘由状语从句
连词有：because as since now that等
区别because, as, since, for
① because表示大家不了解的直接是什么原因或理由，着重点在从句，其所引导的从句，为全句句意的中心所在。一般用于回答why引出的疑问句，语气最强，除特别强调外，该从句一般坐落于主句后面，不可以与so连用但可以与so进行同义句转换。
I didnt go aboard with her because I couldnt afford it.
我没和她一块出国是由于成本太高。
② as引导是什么原因状语从句所传递的一般是已知信息，从句多坐落于主句之前，表示双方那个已知的原因，如：
As I didnt know the way，I asked a policeman.
我不认识路，因而问警察。
③ since引导是什么原因状语从句多表示大伙大家都知道的原因，如：
Since traveling by air is much faster, they decided to take a plane.
既然乘飞机旅游快得多，他们就决定坐飞机。
④ for表示的原因是附加的或判断的，并不是此缘由，一般与主句用逗号隔开，不坐落于句首，如：
He must be not at home, for the telephone isnt answered.
用because, as, since, for 填空：
Well have to go to bed early ___________ well 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 didnt go to school ___________ she was ill.
=_________________________________________________________.
now that引导是什么原因状语从句
Now that 由于;既然，一般可以和since换用。用来表示一种新的状况，再加以推论。如：
Now you have passed your test, you can drive on your own.
你既已考试合格，就能一个人开车了。
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