初中英语知识点总结—原因状语从句讲解
句子大全 2013-07-01 22:02:58
① because表示人们不知道的直接的原因或理由,着重点在从句,其所引导的从句,为全句句意的中心所在。通常用于回答why引出的疑问句,语气最强,除特别强调外,该从句一般位于主句后面,不能与so连用但是可以与so进行同义句转换。
I didn t go aboard with her because I couldn t afford it. 我没有和她一起出国是因为费用太高。 ② as引导的原因状语从句所传递的通常是已知信息,从句多位于主句之前,表示双方那个已知的理由,如: As I didn t know the way,I asked a policeman. 我不认识路,因而问警察。 ③ since引导的原因状语从句多表示大家众所周知的理由,如: Since traveling by air is much faster, they decided to take a plane. 既然乘飞机旅行快得多,他们就决定坐飞机。 ④ for表示的理由是附加的或推断的,并非此原因,通常与主句用逗号隔开,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引导的原因状语从句 Now that 因为;既然 ,通常可以和since换用。用来表示一种新的情况,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,就可以独自开车了。阅读剩余内容