英语从属连词的用法专题学习精编
英语从属连词的用法如下：
引导名词性从句，在句中均不能充当任何句子成分，其中that没有词义，仅起引导从句的作用；whether/how有词义。
引导时间状语从句，表示“当…时候”或“每当”等时间连词。主要有when、while、as、whenever等。
引导条件状语从句，主要有if、unless、as long as、in case等。
that 用于引导宾语从句，引导从句时无意义，常省略。
He told me（that）he won’t be late.他告诉我说他不会迟到的。
though/although (虽然，尽管)，even if/though (即使) 可用于引导让步状语从句，though/although 不能与but连用。
Though he has a cold,he still goes to school.=He has a cold,but he still goes to work.尽管他感冒了，他仍然去上学了。
if, whether (...or not)(是否) 可用于引导宾语从句，不可省略。
I don’t know whether it will rain or not today.我不知道今天会不会下雨。
if (如果), unless (除非；如不), as long as(只要) 引导条件状语从句。

Thought he is very old，he still teaches himself English.尽管他年龄很大，他仍然自学英语。

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because (因为), as (鉴于;由于), since(由于，既然) 用于引导原因状语从句。
I don’t want to go outside because I am too tired.我不想外出因为我太累了。
so...that, such...that 
(如此……以至于……) 可用于引导结果状语从句。
The scenary here is so beautiful that I don’t want to leave.这儿的风景太美了，以至于我不想离开了。
since自从，until/till直到，after在……之后，before在……之前，when当……时候，while当……时侯，as soon as一……就……，whenever无论何时 用于引导时间状语从句。
When I arrived there, it was raining.当我到那里时，天正在下雨。
as if/as though (仿佛；好像) It seems  as if  it is going to rain.好像将要下雨了。
so that（以便） in order that（为了） in case(以防) I get up early so that I won’t be late for class.我起得很早，这样我上课不会迟到。
as...as...(和……一样……), 
not so/as...as... (和……不一样……) 用于引导比较状语从句。
He is as smart as his brother.他和他的哥哥一样聪明。
because, since, as
连词 意义 例句
because 表示造成某种情况的直接原因，语气最强，常用来回答由why引导的问句，其从句的位置通常在主句的后面。 He has to leave because it is too late.因为太晚了，他不得不走。
since since语气比as稍强，不表示直接的或根本的原因，而是一种已知的或非常显然的理由，since引导的从句通常位于主句之前。 Since everyone is here, let’s start.既然大家到齐了，我们就出发吧！
as as是从属连词，表示原因时，语气最弱，所说的原因比较明显或是已知的事实，它引导的从句一般位于主句之前。 We all like her as she is kind.我们都喜欢她，因为她善良。
 
I. 用适当的连词填空。
1. Jim didn’t come to school yesterday __________ he was ill.
2. They haven’t decided __________ they will go or not.
3. He spoke __________ fast __________ I couldn’t follow him.
4. The children were walking along the river __________ they were singing happily.
5. Put on more clothes, __________ you’ll catch a cold.
6. It’s two years __________ he left school.
7.—Would you like to go with us?
—I’d love to, __________ I have to help my father do some housework.
8. Air is __________ a liquid __________ a solid.
9. He will go to see his grandpa __________ __________ __________ he gets through with his homework.
10. Go to Uncle Wang for help, __________ your work can be finished on time.
答案
1. because 2. whether/if
3. so, that 4. while/when/as
5. or 6. since
7. but 8. neither, nor
9. as soon as 10. and

II.按要求转换句型。
1. Mr. Hu left the room after he finished the work. (改为同义句)
Mr. Hu __________ __________ the room __________ he finished the work.
2. He and his parents have gone to Wuhan. (改为同义句)
__________ he __________ his parents have gone to Wuhan.
3. The problem is quite difficult I can’t work it out. (改为同义句)
The problem is __________ difficult __________ I can’t work it out.
It is __________ __________ difficult problem __________ I can’t work it out.
4. He said he would see his teacher at once when he got to Shanghai. (改为同义句)
He said that he would see his teacher __________ __________ __________ he got to Shanghai.
5. My uncle has been away from Hefei for ten years. (改为同义句)
It’s ten years __________ my uncle __________ Hefei.
答案
1. didn’t leave, until/till
2. Both; and
3. so; that; such a; that
4. as soon as
5. since; left

III.选词填空(句子选词填空)。
as          such... that because      since        when
so that so... that until      as soon as while
1. We were swimming in the river __________ it started to rain.
2. Sports, build our body __________ reading builds our mind.
3. It’s __________ a big fish __________ it needs many people to catch it.
4. __________ you have grown up, you should not depend on your parents.
5. The new-type digital camera is expensive __________ few people can afford it.
6. We didn’t go shopping __________ my mother came back.
7. __________ it heard the sound of my father’s car, Dog Buddy rushed to meet him at the gate.
8. We decided to go window-shopping __________ we could see if there was anything on sale.
9. I feel that pandas are the most important animals __________ there aren’t very many of them.
10. I remember the whole thing __________ it happened yesterday.
答案
1. when 2. while
3. such, that 4. Since
5. so that 6. until
7. As soon as 8. so that
9. because 10. as

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