ied.Р(2)as, because, since , forР这四个词都可表原因,但用法有区别。?1) 如果原因构成句子的最主要部分,一般用because。因此,because引导的从句往往放在句末。例如:?I stayed at home because it rained.?---Why aren’t you going??---Because I don’t want to.?.Р(3)if, whether?if和whether都可作“是否”讲,在引导宾与从句是一般可互换。例如:?I wonder whether (if) you still study in that school.?I don’t know whether (if) he likes that film.?在下列情况下,只能用whether,不能用if:?1) 引导主语从句时。例如:?Whether he e to the party is unknown. ?2) 引导表语从句时。例如:?The question is whether I can pass the exam.Р(4)so…that, such...that?so+副词+that?Such+名词或名词短语+that?I’m so tired that I can’t walk any farther.?It was such a warm day that he went swimming.?2) 如果在名词之前有many, much, little, few时,用so,不用such。例如:?He has so little education that he is unable to get a job.?I have had so many falls that I am black and blue all over.
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