for,since ,because的区别

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for,since,because的区别for,since,because的区别for,since,because的区别1.because表示直接原因,它所指的原因通常是听话人所不知道的,其语气最强.

for,since ,because的区别
for,since ,because的区别

for,since ,because的区别
1.because表示直接原因,它所指的原因通常是听话人所不知道的,其语气最强.常用来回答why的提问,一般放于主句之后,也可以单独存在.例如：
(1)I stayed at home because it rained.因为下雨我呆在家里.
(2)Because Lingling was ill,she didn”t come to school.玲玲因病,没有上学.
(3)A:Why is she absent?她为什么缺席?
B:Because she is sick.因为她病了.
此外,在强调句型中,只能用because.例如：
(4)It was because I missed the early bus that I was late for school.我上学迟到是因为我没有赶上早班汽车.
2.since侧重主句,从句表示显然的或已为人所知的理由,常译为“因为”、“既然”,语气比because稍弱,通常置于句首,表示一种含有勉强语气的原因.例如：
(1)Since he asks you,you”ll tell him why.他既然问你,那就告诉他为什么吧.
(2)Since everyone is here,let”s start.既然大家都到齐了,我们就出发吧!
(3)Since I understood very little Japanese,I couldn”t follow the conversation.我日语懂得不多,因而听不懂对话
3.for后可接短语或名词
(1)We have studied English for years.
我们学英语已有好几年了.
(2)They jumped for joy.
他们高兴地跳了起来.
(3)Jim is going to get material for a new book.
吉姆正打算为一部新书准备材料.

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关于这个问题，我以前也提到过：
because:(从属连词）因为，由于
此词较正式，语势较强，通常用来突出强调因果关系，或回答why的问题；because引出的从句在意义，内容上通常比主句更显突出，也可用于指不真实的或不肯定的原因。在上述诸方面，as与since决不可与because换用。
e.g.She is absent again; is it because she has fallen ill?
注意：只有because还可以引导表语从句，as ,since则不可以。
since:因为，鉴于，既然
此词较非正式，较常用于谈话中，意指“有鉴于......" "考虑到......这样的事实",专指我们确实知道其为真实的事实情况,只有在这个意义上,since才可以与because换用。
since you ask, i will tell you.
for:(并列连词）因为
此词是本组辨义中唯一一个并列连词，意义上较正式，很少用于句首，从不用来回答why的问题，常指附加或推导的理由。
试比较because与for的用法：
（明显的因果关系）The ground is all over wet because it had rained last night.
(推导的理由）It must have rained last night, for the ground is wet all over

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