for是用来表示推断的原因或者对主句进行说明的;because引出直接的原因.
because感情最强烈,一般不用于句首,...,becasue...
since和as是从属连词,说明的是已为人们所知和理由.since的语气比because弱,但比as强.since和as引导的从句一般放在句子的开头.since和as的主要区别是:用as引导原因从句语气较弱,所说明原因是附带,而since表示原因暗示着是稍加分析之后才能推断出来原因.
引导原因状语从句的连词
原因状语从句一般由because,since,as,for引导.注意as,because,since和for的区别:
①如果原因是构成句子的最主要部分,一般用because.because引导的从句一般不放在句子的开头.例如:
I missed the train because I got up late.
注:对于以why开头的问句,一般只能用because引导的从句来回答.
②如果原因已为人们所知,或不如句子的其余部分重要,就用as或since、since比as稍微正式一些.as和since引导的从句一般放在句子的开头.
as,since,for 用于句首多,for 不用于句中
because\x0d\x0abecause引导原因状语从句语气最强,表示直接原因,常用来回答由why提出的问题,所引导从句可放在主句前,也可放在主句后。例如:\x0d\x0a"Why did you do it?" "Because Carlos told me to".\x0d\x0aWe can't go to Julia's party because we're going away that weekend.\x0d\x0aBecause he didn't catch the last bus, he had to walk home.\x0d\x0aWhy are you late for school ? Because I missed the first bus.\x0d\x0a\x0d\x0aas\x0d\x0aas “由于,鉴于” 主从并重,从句说明原因,主语说明结果。说明比较明显的原因。多用于日常语中,常译为“由于”,从句一般放于主句前。例如:\x0d\x0aYou can go first as you're the oldest.\x0d\x0aAs you don't feel well, you had better stay at home.\x0d\x0aAs he wasn't ready in time, we went without him.\x0d\x0aI must stop writing now, as I have rather a lot of work to do.\x0d\x0aAs it was getting late, I decided to book into a hotel. As it is raining, you'd better take a taxi.\x0d\x0a\x0d\x0asince\x0d\x0asince “因为,既然” 侧重主句,主句表示显然的或已知的理由。强调说话者和听者双方都知道的原因,常译为“既然”,一般用在这样的句子里。例如:\x0d\x0aSince we've got a few minutes to wait for the train, let's have a cup of coffee.\x0d\x0aSince you are not feeling well, you may stay at home.\x0d\x0aSince everybody is here, let's begin the meeting.\x0d\x0aSince I am a boy, let me carry the case.\x0d\x0aSince/As you are busy, you had better not go with us.\x0d\x0aSince we have no money, we can't buy that vase.\x0d\x0a\x0d\x0afor\x0d\x0afor “因为,由于”表明附加或推断的理由,引导的分句前常有逗号。for分句不放句首.是用来附带解释或说明前一分句的原因和理由。例如:\x0d\x0aDay breaks, for the cock crows.\x0d\x0aIt must have rained last night, for the ground is wet.\x0d\x0aI won't go in, for my father is there.\x0d\x0aHe must be ill, for he is absent.\x0d\x0aI went to see him, for I had something to tell him.
as,because,since都可以表示因果关系,连接原因状语从句,含义是"因为,由于",但它们有区别:because表示的语气最强;as一般放在句首,语气较弱,较口语化;since常常用在书面语中,表示多为对方已知的、或稍加分析便可得知的原因,有时可译作"既然".例如:
(1) He will succeed because he is in earnest.他一定会成功,因为他很认真.
(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握,他会相信你的.
(3) As rain has fallen, the air is cooler.因为下过雨,空气比较清爽.
because, as, for,since, now that的区别为:意思不同、用法不同、侧重点不同。
一、意思不同
1.because意思:因为
2.as意思:当…时;随着;照…方式;因为;由于
3.for意思:因为;由于
4.since意思:从…以后;自…以来;因为;由于;既然
5.now that意思:由于
二、用法不同
1.because用法:because的基本意思是“因为”,强调直接造成某种结果的理由和原因,所引导的原因状语从句多置于主句之后,有时为了强调,也可置于主句之前,并用逗号与句子的其他部分隔开。
2.as用法:as用作副词时主要用来表示比较,意思是“像…一样;如同”。可以单独使用,但更多的是用在as...as结构中,其中第一个as是副词,其后可接形容词或副词,也可接其他成分,as前可有状语。第二个as可以是介词,也可以是连词。
3.for用法:for是并列连词,引导的是并列从句,一般是对结果作出推断性的补充说明或解释,不表示直接原因,for前多加逗号。
4.since用法:since用作介词的意思是“从…以来,自从…之后”,其宾语常指过去的一个时间点,其含意通常指持续到说话时刻的动作或情况开始于什么时候。
5.now that用法:是个短语介词,其后接名词或代词,在句中用作表语,意思是“应归于,应属于,应给予”(在美式英语中往往省略be)。也可用作状语,说明谓语动词所表示动作的原因。
三、侧重点不同
1.because侧重点:because感情最强烈,一般不用于句首。
2.as侧重点:as引导原因从句语气较弱,所说明原因是附带。
3.for侧重点:for是用来表示推断的原因或者对主句进行说明的。
4.since侧重点:since是从属连词,语气比because弱,引导的从句一般放在句子的开头。
5.now that侧重点:引导原因状语从句,一般放于句首。
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