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because / since / as / for 四个词均表示原因,都是连词,其中because,since as为从属连词,引导原因状语从句,for为并列连词,一般不引导状语从句.四个词的语气由强至弱依次为becausesinceasfor (1)because意为因为,表直接原因,回答why引导的原因状语,引导从句多用于主句之后. (2)since意为既然,由于,侧重主句,从句表示已知的理由. (3)as 意为由于,鉴于主句说明结果,从句说明原因. (4)for意为因为,由于,表示附加或推断的理由.多用逗号隔开,一般不放在句首. My father went to work on foot because his bike was broken. 我父亲步行上班因为他的自行车坏了. As it is raining now,lets go home. 既然天在下雨我们现在回家吧 Since he is new here,he looks strange. 由于他是新来的他看上去很陌生 Why do you like tigers? ______ theyre cute. A For B Since C Because D As see 作动词意为看见,强调看的结果. 还可表示想一想,明白之意 Can you see the book on the desk? This is my book It isnt your book. Do you understand? oh,I see. look see watch | 
