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Unit7.原因状语从句because,since和as的区别:(1)关于because:语气最强,表示直接原因(原因是人们未知的),可用于回答why提出的问题、引导表语从句、用于强调句等,而其余三者均不行:“Why didnt he come?” “Because he was ill.”“他为什么没来?”“因为他病了。”My stomach hurts because I have eaten too many apples.我肚子痛,因为苹果吃得太多。Thats because you cant appreciate music.这是因为你不能欣赏音乐。It is because he is honest that I like him.是因为他诚实我才喜欢他。注意:because和so不可同时出现在一个句子里。becauseof也表示原因,但它后面不接从句,只能接名词,代词或动名词。IdoitbecauseIlikeit.=IlikeitsoIdoit.Wewentbybusbecauseitwascheaper.=Itwascheapersowewentbybus.Hecantgotoschoolbecauseofhisillness.(2)关于since与as:两者所表示的原因都是人们已知的,即对已知事实提供理由,而不是表示直接原因。since比as语气稍强,且比as略为正式,它们引导的从句通常放在主句之前,有时也放在主句之后:(since通常被翻译成“既然”=nowthat. 侧重主句。)(as通常被翻译成“由于”。 主从并重,从句说明原因,主句说明结果。)As you werent there, I left a message.由于你不在那儿,我留了个口信。As you are tired, you had better rest.Since you are wrong, you should apologize.你既然错了,就应该道歉。Now (that) you are grown up, you should not rely on your parents.练习:(1)He didnt go to work the heavy rain.A .because B.because of C.so D.since(2)Hetookoffhiscoat_hefelthot.A.becauseB.asC.ifD.since(3)_thedaywenton,theweathergotworse.A.With B.Since C.While D.As(4)Wang Xiao didnt go to school. She had a fever. (合并为一个复合句) Wang Xiao didnt go to school _she had a fever.答案:B,A,D,because
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