來源:網(wǎng)絡來源 作者:中考網(wǎng)編輯 2021-03-21 18:47:53
中考網(wǎng)整理了關于2021中考英語連詞知識點之常用連詞的用法辨析,希望對同學們有所幫助,僅供參考。
�。�1)while, when, as
這三個連詞都可引導時間狀語從句,但用法有所不同。
1)當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)如果原因構成句子的最主要部分,一般用because。因此,because引導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引導的從句幾乎可以放在括號里。For引導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:
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