编辑:
2016-01-11
这四个词都可表原因,但用法有区别。
1) 如果原因构成句子的最主要部分,一般用because。因此,because引导的从句往往放在句末。例如:
I stayed at home because it rained.
---Why aren’t you going?
---Because I don’t want to.
2) 如果原因已被人们所知,或不如句子的其它部分重要,就用as或since。Since比as稍微正式一点。As和since 引导的从句一般放在句子的开头。例如:
As he wasn’t ready, we left without him.
Since I have no money, I can’t buy any food.
3) for用来补充说明一种理由,因此,for引导的从句几乎可以放在括号里。For引导的句子不放在句子的开头。例如:
I decided to stop and have lunch----for I was feeling quite hungry.
(3)if, whether
if和whether都可作“是否”讲,在引导宾与从句是一般可互换。例如:
I wonder whether (if) you still study in that school.
I don’t know whether (if) he likes that film.
在下列情况下,只能用whether,不能用if:
1) 引导主语从句时。例如:
Whether he will come to the party is unknown.
2) 引导表语从句时。例如:
The question is whether I can pass the exam.
3) 在不定式前。例如:
I haven’t made up my mind whether to go there or not.
(4)so…that, such...that
1) so…that中的so是个副词,其后只能跟形容词或副词,而such...that中的such是个形容词,后接名词或名词短语。例如:
I’m so tired that I can’t walk any farther.
It was such a warm day that he went swimming.
2) 如果在名词之前有many, much, little, few时,用so,不用such。例如:
He has so little education that he is unable to get a job.
I have had so many falls that I am black and blue all over.
(5)either…or…, neither…nor, not only…but also…
这三个连词词组都可连接两个并列成分。当它们连接两个并列主语时,
谓语动词要随相邻的主语变化。例如:
Either you or he is wrong.
Neither he nor his children like fish.
Not only the teacher but also the students want to buy the book.
(6)although, but
这两个连词不能用在同一个句子中。例如:我们不能说“Although he is
over sixty, but he works as hard as others.”这个句子应改为:Although he is over sixty, he works as hard as others.或He is over sixty, but he works as hard as others.
(7)because, so
这两个连词同样不能用在同一个句子中。例如:我们不能说“Because John
was ill, so I took him to the doctor.” 这个句子应改为Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor.
这篇2016中考英语考点梳理的内容,希望会对各位同学带来很大的帮助。
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