2016中考英语知识点梳理:介词和连词讲解

2015-09-15 15:49:34来源:网络

  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.

  来源:新东方在线论坛


微信扫码加入【初中群】免费领取

6G初中全科学习资料

更多资料
更多>>
更多内容

初中学英语资料大礼包合集

扫描下方二维码自动领取

初中资料
更多>>
更多英语课程>>