中考英语重点辅导资料指导：缘由状语从句
连词有：because as since now that等(1) 区别because, as, since, for① 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.=|||||||||||||||||||||||||||||||||||||||||||||||||||||||||.(4) 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(that) 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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