表示原因的6种句型

表示原因的6种句型上海初中高中英语教研【句型1】主句＋because＋原因状语从句说明：此句型中，because是个连词，它用来表示直接的原
因，一般来说原因状语从句放在主句之后，有时为起强调作用原因状语从句可以置于主句之前。1.You should not despis
e a man because he is poor.你不应该因为一个人穷而轻视他。2.I am strict with you
because I want you to make rapid progress.我对你严格是因为我希望你迅速进步。（如果要强调
原因，原因状语从句可置于主句之前。如：Because I want you to make rapid progress,I am
strict with you.）3.I went to bed early because I was tired.我因为疲倦
所以提早睡觉了。?（如果要强调原因，原因状语从句可置于主句之前。如：Because I was tired,I went to b
ed early.）句型2】Since＋原因状语从句＋主句说明：since表示“原因”与as差不多，它所强调的是主句的内容，其原因
是附带说明的。但since不同于as的地方，在于它所表示的原因是暗示出来的或稍加分析出来的。since与because相比，sin
ce的意味稍弱于because。1.Since we''re young,we shouldn''t be too afraid of
making mistakes.因为我们还年轻，不应该太害怕犯错误。2.We had to put the meeting of
f since so many students were absent.由于许多学生都没来，会议只好延期。3.Since we
live near the forest,we enjoy a health climate.因为我们住在靠近森林的地方，所以我们
能享受到有益健康的气候。句型3】As＋原因状语从句＋主句说明：as从句所说明的原因是比较明显的，已为大家所熟知的。as引导的原因状
语从句在语气上比because引导的从句弱一些，as从句虽然常出现在主句前面，但它证明的理由是附带的，而不是特别强调的。(1)As
I had a cold,I was absent from school.因为我感冒了，所以没去上课。(2)As he is
a qualified doctor,I trust his advice on medical matters.因为他是个合格的
医生，所以在医疗上我接受他的建议。(3)As rain has fallen,the air is cooler.因为下了雨，空气
比较清爽。　【注意点】1.because,as,since与so都不能同时使用。［误］Because she got up lat
e,so she couldn''t come here on time.［正］Because she got up late,sh
e couldn''t come here on time.［误］As he didn''t get up,so we went wi
thout him.［正］As he didn''t get up,we went without him.［误］Since you
know it already,so I needn''t tell you.［正］Sinee you know it alrea
dy,I needn''t tell you.　2.不要把the reason...与because连用。［误］The reason
why he was late because his mother was i11.?[正］The reason why he
was late was that his mother was i11.【句型4】第一并列分句（表示结果），for＋第二并列分
句（表示原因）说明：for作连词时常用于书面语，比because更为正式，一般用逗号或分号和前面部分分开，它所引出的句子对前面的句
子起解释作用。作为连词的for，既然是用以说明或解释前句的，它就必须出现在前句之后和后句之首，这就是它与若干同义词的差别，试比较：
He did notcome for/as he was ill.（他没有来是因为他病了。）这句原文可改为：As he was i
ll,he did not come.但不可改为：For he was ill,he did not come.1.It must
have rained in the night,for when I woke the next morning I saw
the grass wet.当我次日一早醒来时看到草地是湿的，想必是前一天晚上下过雨。2.He felt no fear,for
he was very brave.他一点也不害怕，因为他很勇敢。3.He couldn''t go,for he was ill.
他因为病了所以不能去。【注意点】在以下两种情况下一定要用because，不能用as或for。1.原因状语从句结合在“It is..
.that”强调句型当中，一定要用because。It is because he has behaved so badly th
at he must be punished.正因为他的行为不检点，所以该受处分。2.在回答Why问句时，也只能用because。
Why was he late?Because he got up late.他为什么迟到了？因为他起床晚了。句型5】Not　th
at...,but that...说明：本句型指的是肯定一个原因，否定另一个原因，两个原因或理由一正一反，前后对比。1.Not t
hat it matters,but that how did you spend the money I gave you？我不
是说有什么关系，可是我给你的钱你是怎么花的？2.Not that I don''t like to play basketball,
but that I like to play football.不是我不喜欢打篮球，只因为我喜欢踢足球。3.Not that s
he forgot to do her homework,but that she was busy nursing a sick
classmate.不是她忘记了做作业，只因为她忙着照顾一个生病的同学。句型6】主语＋谓语＋（原因状语）说明：这三个短语（owe
to、due to、thanks to）都表示“由于”“因为”，thanks to系由thank派生而来的，所以又含有“幸亏”的
意思，due to中的due原意是“应得的”，在这里用于连接因果关系，多指一种必然的现象。owing to也有“幸亏”“由于”的意
思，三个词语可以作定语和表语。1.I was late thanks to the traffic.由于交通路况不佳我迟到了。（注
：这里的thanks to表示的是“由于”“因为”的意思。）2.It was thanks to his advice that
I succeeded.幸亏他的忠告我才得以成功。（注：这里的thanks to表示的是“幸亏”的意思。）3.The accident is due to your careless driving.那次意外事故归因于你的驾驶不小心。4.It was owing to this difficulty that the plan did not succeed.这计划不能成功，就是由于这个困难的缘故。