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because、as、for、since的区别 1、because表示事情发生的直接原因或理由，它的语气很强。 He didn’t come to school yesterday because he was ill. 3种情况必须用 because 1)回答why的提问,必须用because。 —Why didn't he come yesterday? —________ he had something important to do. A．Because B．As C．Since D．For 2)当有only，, all, partly, merely 等强调词或not等否定词时， The two girls were late again, which was partly because they got up late. 3) 在强调原因状语从句时，只能用because。 It was because it rained hard that they put off the football match. 2、 since常表示对方已经知道的既成事实，说话人根据这个事实得出某一种结论。其语气比because要弱，一般译成“既然”。如： Since you are here, why not stay for a few more days? 3、 as常用于表示十分明显的原因，说明因果关系，重点放在主句上，语气较弱，常译成“由于”。如： As it’s getting darker, we must go home now. 4、 for只是一个并列连词，用于连接两个并列句，表示推理或解释，对前一个分句进行附加说明。如： It must have rained last night, for the ground is wet |
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