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2024年初中英语语法精讲之 从属连词
常见的从属连词有：
(1)引导时间状语从句的after, before, when, while, as, until, till, since, as soon as等。(2)引导条件状语从句的if, unless等。
(3)引导原因状语从句的because, as, since等。
(4)引导目的状语从句的so that, in order that等。
(5)引导让步状语从句的though, although, even if等。
(6)引导结果状语从句的so that, so…that, such…that等。
(7)引导比较状语从句的than, as…as等。
(8)引导名词从句的that, if , whether等。
1 that
I think（that） he likes football.
我想他喜欢足球。
that引导名词性从句（主语从句、表语从句、宾语从句和同位语从句）和定语从句，本书只介绍宾语从句。
1.that在宾语从句、间接引语中可以省略，主句与从句时态一致。
I think（that） he is tired.我想他累了。
I thought（that） he was tired.
注意
要特别注意主句与从句时态的呼应。如果主句是过去时，从句一律改为过去的时态，详见第二十章宾语从句。
2.如果主句的动词是 think， believe…；如果主句的主语是第一人称，变为否定句时，要否定主句，译成中文时，则否定从句。
I believe you will leave here.
我相信，你会离开这儿的。
I don't believe you will leave here.
我相信，你不会离开这儿的。
必背！
I hope that～我希望～
I think that～我认为～
I say that～我说～
I know that～我知道～
I find that～我发现～
be afraid that～恐怕～
be sure that～确认～
be glad（happy） that～很高兴～
（以上的that都可以省略）
2 when，while，till，until，since…
When he arrives there he will call you.
他到达那儿以后，他会给你打电话。
when， while， till， until， since， after， before， as soon as等是连接时间状语从句的连词。在时间状语从句中要特别注意时态的搭配：当主句是将来时，从句要用一般现在时。
注意
while所引导的从句的谓语动词只能是延续性的，不能用点动词。（如begin，stop…）
When I arrived there， it was raining.
当我到那儿时，天正在下雨。
I entered the room while（when） Li Ming was talking with her.
我进屋时，李明正在和她谈话。
I didn't go to sleep until（till）I finished my homework.
直到我做完作业，我才上床睡觉。
We won't work until（till） our teacher teaches us how to do it.
老师教给我们如何做这工作之后，我们才会开始做。
He came to China after the war was over.
比较
连词连接从句不同，意思不同。
He had been in China before the war was over.
战争结束前，他已经在中国了。
=The war was over before he came to China.
=The war had been over before he came to China.
战争结束后，他来到中国。
I have learned more than two thousand English words since I began learning English two years ago.
自从两年前我开始学习英语以来，我已经学习了两千多个英语单词了。
注意
since引导的是一个过去时的句子，说明自当时以来到现在（自从两年前以来），主句一般要用现在完成时。
As soon as I get enough money，I'll buy it.
我一得到足够的钱，就买它。
3 because：因为，连接原因状语从句
She didn't go there，because she was ill.
因为她病了，所以她没去那儿。
1.回答Why问句时，只能用because，不能用for或 as.
Why are you late？
你为什么迟到？
Because I met a traffic accident on my way here.
因为在我来这儿的路上，遇到了车祸。
2.汉语中，我们经常说因为……所以，但在英文中有了because，就不能再用so。
（×）Because he was tired， so he couldn't walk there.
因为他累了，所以他不能走到那儿了。
4 if，though （although）
If it doesn't rain，we'll go to the park.
如果不下雨，我们就去公园。
Though I was tired， I still worked hard.
虽然我很累，可是我仍然努力地工作。
1.if：如果（引导条件从句）
You can pass the exam if you study hard.
如果你努力学习，你会及格的。
2.though，although：虽然（引导让步状语从句）和原因状语从句一样，如果用了though，although （虽然）就不能再用but（但是）。
Although（Though） I live near the sea， I'm not a good swimmer.
=I live near the sea，but I'm not a good swimmer.
虽然我住在海边，可是我游泳并不好。
注意
注意时态一致，和时间状语从句一样。主句是将来时之时，从句要用一般现在时。
5 so…that：太……以致……
He is so old that he can't work. = He is too old to work.
他太老了，不能工作。
The box is so heavy that I can't lift it.
=The box is too heavy for me to lift.
箱子太沉了，我抬不起来。
The girl is so beautiful that everybody likes her.
这个小女孩太漂亮了，每个人都喜欢她。
注意
注意此句型与too…to的互换。
so…that在肯定句中不能转换成too…to…。
三 连词比较
I　and 与or
1) 并列结构中，or通常用于否定句，and用于肯定句。
2) 但有时and 也可用于否定句。请注意其不同特点：
There is no air or water in the moon.
There is no air and no water on the moon.
在否定中并列结构用or 连接，但含有两个否定词的句子实际被看作是肯定结构，因此要用and。
IV 比较so和 such
其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so是副词，只能修饰形容词或副词。so 还可与表示数量的形容词many，few，much， little连用，形成固定搭配。
so + adj.　　　such + a(n) + n.
so + adj. + a(n) + n.　such + n. (pl.)
so + adj. + n. (pl.)　　　 such +n. (pl.)　
so + adj. + n. [不可数]　　such +n. [不可数]
so foolish　　　　　　　　 such a fool　
so nice a flower　　　　　 such a nice flower
so many/ few flowers　　　 such nice flowers
so much/little money.　　　such rapid progress　
so many people　　　　　　 such a lot of people
so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。
so…that与such…that之间的转换既为 so与such之间的转换。
Ｅg :The MP3 cost me ________ money that I ccouldn't afford to buy it .
A .so much .B .such much C .so many D . such many .(Key :A )
注意:too .... to .. ,so ..... that .... , such .... that .... , enough ..... to ...., 的互换．
so that to = in order to /that 的用法．
Eg A .He is too young to go to school.
B .He is ____ a young boy _____ he ____ go to school .
C .He is ____ young ____ he ____ go to school .
D .He isn't ______ _______ ______ go to school (Keys :B :such , that , can't C :so ,that ,can't .D : old ,enough to )
易错分析：
①关于not…until
He stayed there until it was very late.
句中，stay是可延续性动词，所以不用not。
He didn't leave until it was very late.
句中，leave是不可延续性动词，所以用not
②because, so；although, but
上面已经提到，because和so及although和but不连用。
例如:
Because he was late, he didn't catch the first bus.
一定不可以说
Because he was late, so he didn't catch the first bus.
③or还是and
祈使句＋or＋陈述句前后是对立的
祈使句＋and＋陈述句前后是统一的
(or或and后的陈述句，常用一般将来时)
Study hard, or you won't pass the exam.
Study hard, and you will pass the exam.
两句都可以转换成“If条件句＋主句”形式，注意：要去掉or和and：
If you don't study hard, you won't pass the exam.
If you study hard, you will pass the exam.
④because, since, as, for表示原因时的区别
尽管because, for, since, as都表示原因，但是用法上有不同.
because通常表示说话人认为这种理由或者原因是听话人所不知道的.
如:
He didn't attend the meeting because he had too much work to do.
since表示的原因是人们已知的事实，常译作“既然”。
如：
Since he can't answer this question, you'd better ask someone else.
as表示原因与since差别不大，只是语气更弱,多译为“由于”
如：
As I haven't seen the film, I can't tell you what I think of it.
for表示因果关系时，只能放在主句之后，不能放在句首。而且经常是对主句补充说明理由或推断原因。
如：
It rained last night, for the ground is wet.
⑤ as, when, while
这三个连词都可引导时间状语从句，但用法有所不同。
1) 当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。例如：
As/When/While I was walking down the street I noticed a police car.
2) 当两个长动作同时进行的时候，最常用的是while。例如：
While mother was cooking lunch, I was doing my homework.
3) 当两个动作都表示发展变化的情况时，最常用的是as。例如：
As children get older, they become more and more interested in things around them.
4) 当两个短动作同时发生时，或表示“一边…一边…”时，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) 当从句的动作先于主句的动作时，通常用when。例如：
When he finished his work, he took a short rest.
6) 当从句是瞬间动作，主句是延续性动作时，通常用when。例如：
When John arrived I was cooking lunch.
（6）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.
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.

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