连词
一、知识要点
1. 连词的概念
连词是连接单词、短语、从句或者句子的一种虚词,在句子中不能单独作句子的成分,一般不重读。连词基本可以分为:
①简单连词:如:or and but if because
②关联连词:如:both and not only…but also…
③短语连词:如:as if as long as in order to so that
2. 连词的用法
A. 并列连词
①表示平行或者对等关系,常用的有and so not only…but also…(不仅……而且……) both…and…(两者都……) neither…nor…(既不……也不……)等。
Not only does he love the teachers, but also the teachers love him. 他爱老师,老师也爱他。
②表示转折关系,常用的有but,yet(然而),while(然而)等。
I am poor,but I am very happy. 我很贫穷,但是我很愉快。
③表示选择关系,常用的有or,either…or…(或者……或者……),not …but …(不是……而是……)等。
You may go with us,or you may stay at home. 你或者和我们一起去,或者呆在家里。
④表示因果关系,常用的有:for (因为),so(因此)等,此时for不能放在句首。
He must sleep, for his room is dark. 他一定睡了,因为房间是暗的。
B. 从属连词
①引导时间状语从句,常用的有:before after when while until since as soon as等。
I will come to tell you as soon as it comes out. 结果一出来我就来告诉你。
②引导原因状语从句,常用的有:because(因为),as(因为),since(既然)
Because it was too late, we took a taxi. 因为天晚了,我们打了一辆出租车。
③引导结果状语从句,常用的有:so… that(如此……以致于),such…that(如此……以致于),
so that(结果……)等。
She was so careless that she forgot to write her name on the paper.
她那么粗心,都忘记在卷子上写名字。
④引导条件状语从句,常用的有:if,unless(除非),as long as(只要)等。
We will come here if it is fine tomorrow. 如果明天天气好的话我们就来这里。
⑤引导让步状语从句,常用的有:though,although,even if(即使),however(无论怎样)等。
We were still working though it was very late. 尽管很晚了我们仍然在工作。
⑥引导比较状语从句,常用的有:as,than,so/ as…as,more than。
This book is more interesting than that one. 这本书比那本更有兴趣。
⑦引导地点状语从句,常用的有:where, wherever等。
Please stay where you are. 请呆在你现在的地方。
⑧引导名词性从句(如宾语从句),,常用的有:that if whether who whom what which
whose when where why how。
Can you tell me when they got there? 你能告诉我他们是什么时候到那里的吗?
I think that he’ll be back soon. 我认为他们不久就会回来。
几个注意
①not only… but also…, neither… nor …, either … or…, not … but…接主语时,谓语动词按就近原则处理。
Not only you but also he has to leave. 不只是你,他也得离开。
Either you or I am wrong. 不是你错,就是我错。
Not money but workers are what we need. 我们需要的不是钱,而是工人。
②祈使句,+and/ or +简单句,前面的祈使句表条件,后面的简单句表结果,or意思为“否则”。
Hurry up, and we’ll catch the bus. 快点,我们就能赶上车。
Hurry up, or we’ll be late. 快点,否则我们会晚的。
③英语中表示因果关系的连词与引导原因状语从句的连词一般不能同时使用,同样引导让步状语从句的连词和表示转折关系的连词也不能连用。这一点和汉语完全不同。
Though he is young, he can help his mother a lot.
虽然他很小,但是能给他妈妈帮很多忙。(无but)
It was too hot in the room, so he took off his coat.
因为房间里很热,所以他脱掉了外套。(无because)
二、易错点
1. Because he was ill, so my father didn’t come to my party.
解析:从句子的意思理解上下句是因果关系,英语中因为“because”和所以“so”一般不连用,所以去掉so。
2. Both you and he has to go there on foot.
解析:表并列关系的连词both…and连接主语时,谓语动词应该用复数,所以把has改为have。
3. I am ill, and I still go to school.
解析:从前后两个句子的意思理解是转折关系,所以用连词but表示转折。表示“尽管我病了,我仍然去上学”。所以把and改为but。
4. —Which do you like better, tea and coffee? —I like tea better than coffee.
解析:从问句的前半句Which do you like better可以判断后面用连词or表示选择关系。所以把and改为or。
5. My brother likes swimming better to studying.
解析:从句子的意思理解是用连词than引导表示比较的状语从句。所以把to改为than。但是prefer… to…,是固定搭配,表示“和……相比,更喜欢……”。
6. We want to know as your father will come to our party tomorrow.
解析:从句子的意思理解可以看出“We want to know”后面是宾语从句,而as不能引导宾语从句,应该用连词if/whether表示“是否”或when表示“什么时候”来引导的宾语从句。所以把as改为if/whether/when。