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,because, as, since, for,表原因的用法区别,because (因为)的用法: 通常表示直接而明确的原因和理由,语气很强,用来回答why的问题, 多放于主句之后。 例:因为天气太冷,我们不能外出。 We couldnt go out because it was too cold.,as: “因为、由于”,语气比because弱,表示的是不言而喻、显而易见的原因和理由,其从句一般放在主句前. 如:由于时间很晚了,我们很快就回来. As it was late , we came back soon. 因为下过雨,空气比较清爽。 As rain has fallen, the air is cooler.,since: “既然”, 语气较弱,强调已知的事实,其从句一般放在主句前。 既然你回答不出这个问题,我就问别人了。 Since you cant answer the question, Ill ask someone else. 既然他的方法不行,我们就试试你的吧. Since his method doesnt work, lets try yours. 既然你对此如此有把握,他会相信你的。 Since you are so sure of it, he”ll believe you.,for:并列连词,表示对前一分句补充说明,放在句末。 例:一定是清晨了,因为鸟儿在叫。 It must be morning for the birds are singing. 要下雨了,因为天气越来越暗了。 It will rain, for its getting dark。,原因状语从句 (Adverbial Clause of Cause),1. because since as for的用法区别,He introduced me because I was new. Since you are going, I will go, too. As it is raining, youd better take a taxi. It must have rained last night, for the ground is wet.,
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