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中考英語語法知識點:介詞和連詞(2)
6.從屬連詞
從屬連詞用來引導(dǎo)從句。常見的從屬連詞有:
(1)引導(dǎo)時間狀語從句的after, before, when, while, as, until, till, since, as soon as等。(2)引導(dǎo)條件狀語從句的if, unless等。
(3)引導(dǎo)原因狀語從句的because, as, since等。
(4)引導(dǎo)目的狀語從句的so that, in order that等。
(5)引導(dǎo)讓步狀語從句的though, although, even if等。
(6)引導(dǎo)結(jié)果狀語從句的so that, so…that, such…that等。
(7)引導(dǎo)比較狀語從句的than, as…as等。
(8)引導(dǎo)名詞從句的that, if , whether等。
7.常用連詞的用法辨析
(1)while, when, as
這三個連詞都可引導(dǎo)時間狀語從句,但用法有所不同。
1)當(dāng)某事正在進行的時候,又發(fā)生了另一件事。While, when, as 都可用來引導(dǎo)表示“背景”的時間狀語從句。例如:
As/When/While I was walking down the street I noticed a police car.
2)當(dāng)兩個長動作同時進行的時候,最常用的是while。例如:
While mother was cooking lunch, I was doing my homework.
3)當(dāng)兩個動作都表示發(fā)展變化的情況時,最常用的是as。例如:
As children get older, they become more and more interested in things around them.
4)當(dāng)兩個短動作同時發(fā)生時,或表示“一邊…一邊…”時,最常用as。例如:
Just as he caught the fly, he gave a loud cry.
She looked behind from time to time as she went
5)當(dāng)從句的動作先于主句的動作時,通常用when。例如:
When he finished his work, he took a short rest.
6)當(dāng)從句是瞬間動作,主句是延續(xù)性動作時,通常用when。例如:
When John arrived I was cooking lunch.
(2)as, because, since , for
這四個詞都可表原因,但用法有區(qū)別。
1)如果原因構(gòu)成句子的最主要部分,一般用because。因此,because引導(dǎo)的從句往往放在句末。例如:
I stayed at home because it rained.
---Why aren’t you going?
---Because I don’t want to.
2)如果原因已被人們所知,或不如句子的其它部分重要,就用as或since。Since比as稍微正式一點。As和since 引導(dǎo)的從句一般放在句子的開頭。例如:
As he wasn’t ready, we left without him.
Since I have no money, I can’t buy any food.
3)for用來補充說明一種理由,因此,for引導(dǎo)的從句幾乎可以放在括號里。For引導(dǎo)的句子不放在句子的開頭。例如:
I decided to stop and have lunch----for I was feeling quite hungry.www.zhongkao5.com//
(3)if, whether
if和whether都可作“是否”講,在引導(dǎo)賓與從句是一般可互換。例如:
I wonder whether (if) you still study in that school.
I don’t know whether (if) he likes that film.
在下列情況下,只能用whether,不能用if:
1)引導(dǎo)主語從句時。例如:
Whether he will come to the party is unknown.
2)引導(dǎo)表語從句時。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是個副詞,其后只能跟形容詞或副詞,而such…that中的such是個形容詞,后接名詞或名詞短語。例如:
I’m so tired that I can’t walk any farther.
It was such a warm day that he went swimming.
2)如果在名詞之前有many, much, little, few時,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…
這三個連詞詞組都可連接兩個并列成分。當(dāng)它們連接兩個并列主語時,
謂語動詞要隨相鄰的主語變化。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
這兩個連詞不能用在同一個句子中。例如:我們不能說“Although he is
over sixty, but he works as hard as others.”這個句子應(yīng)改為: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
這兩個連詞同樣不能用在同一個句子中。例如:我們不能說“Because John
was ill, so I took him to the doctor.” 這個句子應(yīng)改為Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor.
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