來源:網(wǎng)絡資源 2023-07-08 11:40:59
英語詞匯與語法基礎知識
連詞
連詞在句中的作用是把詞與詞、短語與短語、句子與句子連接起來。它不能在句中單獨作句子成分。
知識點概述
并列連詞和從屬連詞的用法
連詞是連結單詞、短語、從句或句子的虛詞, 在句子中不單獨作句子成份。
連詞按其性質(zhì)可分為:
1.并列連詞 如:and, or, but, for,等, 連接并列的詞與詞,短語與短語,句子與句子。
如:Rice and potatoes are common foods. (詞與詞)
Today we can travel by plane. (短語與短語)
Many trees lose their leaves in winter, but evergreen trees do not. ( 句子與句子)
關聯(lián)連詞是一類成對使用的連詞
如:both……and……, not……but…….
notonly……but also…… not only…but… as well
either……or…… neither……nor……
關聯(lián)連詞必須后接同樣的語法結構。
如:Either the windows were opened or the door was opened.
2.從屬連詞 如:that, whether, when, because, though 等, 用以引導名詞性從句和狀語從句。
3.從屬連詞引導的從句不可以被斷成一個句子。如果斷開,就錯了。
如:When the alarm clock rang.(不完整)
4. though (although)引導讓步狀語從句,because 引導原因狀語從句, 所以though(although)不能和并列連詞but ,because 不能和并列連詞 so一起使用。只能單獨使用。
二、復習時需要注意的要點
(1)表示選擇關系的連詞,連接的雙方只取其一。常用連詞有or, either...or, otherwise
例如:
1)You can go to Beijing either today or tomorrow
2)Youmust get up early or you won’t catch the early bus.
(2)表示轉折關系,連接的雙方構成對比,意義上有轉折。常用連詞有but, however, while, only
例如:
1)His brother is fond of football while he likes basketball.
2)You can watch TV, but you must finish your homework first.
(3)表示聯(lián)合關系,聯(lián)合的雙方是對等的,意義上趨向一致。常用連詞有:and, both...and, neither...nor, not only...but also, as well as, together with
例如:
1)To study English well, we need both diligence and careful.
2)That horse is not only the youngest among the five, but also runs the fastest.
(4)表示因果關系,連接的雙方,互為因果,或者前因后果,或者前果后因。常用的連詞有:for, so, therefore
例如:
1)It must have rained, for the ground is wet.
2)You are in the right, therefore they should support you.
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