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1、-since, for, because, as, now that 表原因的用法区别-第 3 页since, for, because, as, now that 表原因的用法区别in that通常用now that,是既然的意思。since,for,because,now that的用法和区别:1.since(既然)语气较弱,强调已知的事实。例:Since you cant answer the question, Ill ask someone else.既然你回答不出这个问题,我就问别人了。2. for(因为)的用法:for是并列连词,表示推断的原因,或对前一分句补充说明理由。例:It
2、 must be morning for the birds are singing.一定是清晨了,因为鸟儿在叫。3. because (因为)的用法:because通常表示直接的原因。because引导的从句表示直接而明确的原因和理由,表示按因果关系的推断,语气很强,用来回答why的问题, 一般位于主句之后。例:We couldnt go out because it was too cold. 因为天气太冷,我们不能外出。4. now that(既然)的用法:now that同since相似,语气较弱,强调人们已知的事实。例:Now that you are busy, let me do
3、 it for you.既然你忙,就让我给你做吧。5. as意为“因为、由于”,语气比because弱,所引导的从句表示的是不言而喻、显而易见的原因和理由,其从句一般放在主句前,如:As it was late , we came back soon.(由于时间很晚了,我们很快就回来。)区别:since和now that,表示事物发展的自然结果,特别是当对方大概已经了解其原因的情况下使用,表示既成事实的原因一般位于主句之前。注意:for是并列连词,引出的原因较间接,似乎是事后所想到的补充解释的理由,只陈述一般推断的理由,不一定表示产生结果的必然原因,主要放在两个并列句之间。because通常表
4、示直接的原因。As to 与 As for 用法小结在英语中表示“就而论”“有关”或“至于”含义的词语颇多,其中 as to 和 as for 亦表此义,但二者用法不尽相同。 as to 的功能类似于 with regard to, regarding, on the matter of, concerning 等,常用于相当正式的语境中,尤其用于争论和做出决定时。可放于句首或与 wh- 疑问词引导的动词不定式和名词性从句连用(有时可省略),而 as for 无此种用法。例如: As to the journey, we must decide about that later. 至于旅行,我
5、们必须以后再作决定。 As to the flood, I have heard nothing. 至于那次水灾,我没听到什么。 Nobody could decide ( as to ) what to do. 谁也不能决定该做些什么。 He is very uncertain as to whether its the right job for him. 关于他究竟是否适合做这项工作,他实在拿不准。 A question arose as to who should be the monitor. 关于谁当班长的问题出现了矛盾。 I want to find out as to whom
6、 this bicycle belongs to. 我要打听出来这辆自行车是谁的。 as to 有时用于表示 according to 的含义。例如: They sorted the eggs as to size and color. 他们按照大小和颜色将鸡蛋进行分类。 as for 和 as to 都可用于句首,引出一个与前一个话题稍微有些不同的话题,但 as for 在语体上不如 as to 正式,并且着重话题的转换,也就是说,它所引导的是前面尚未提到过的新的事情,因此它不能用于文章的开头。另外, as for 有时表达轻蔑的语气。例如: We had a delightful week
7、end in the country. As for the traffic, we had no difficulty. 在乡下我们度过了一个愉快的周末。至于交通,我们没有遇到任何困难。 Much pasture land is under water; as for the grain, most of that has been ruined. 大部分的牧场都进了水,至于谷物,则大部分都被冲毁了。 You can have a bed; as for him, hell have to sleep on the floor. 有一张床给你,至于他,就只能睡在地板上了。 As for hi
8、m, I know nothing. 至于他,我一点也不了解。 As for this subject, I couldnt remember. 至于这个题目,我记不起来了。 As for you, I never want to see you here again. 至于你,我永远也不愿在此见到你。in order to 与 so as to两个短语。它们一般都放在句中用于引导目的状语;但in order to 可以放在句首,而so as to 则一般不放在句首。opt 加入生词本vi.选择, 抉择opt to do sth.选择做某事They opt for more holiday instead of more pay.他们选择了延长假期而不是增加工资。习惯用语 opt for (从多种方案中)作出选择 opt in 决定参加 opt out (of) 决定不参加或退出