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从属连词通常引导一个从句，作主句的一个成分。
从属连词一般分为引导名词性从句的从属连词和引导状语从句的从属连词。
▶ 引导名词性从句的从属连词
引导名词性从句的从属连词主要有that、if、whether、because、as if等。
that、whether 可以引导主语从句、宾语从句、表语从句和同位语从句；
if一般引导宾语从句，引导主语从句时只能用 it作形式主语；
because、as if 引导表语从句。
I don’t think that we should stay another week.
我认为我们不该再待一周。
Can you tell me if he can come to my birthday party?
你能告诉我他是否会来参加我的生日派对吗?
Whether he’ll come is unknown.
没人知道他是否要来。
The notice came around two in the afternoon that the meeting would be postponed.
下午两点左右来了通知，说会议要延期。
From space, the earth looks blue. This is because about seventy-one percent of its surface is covered by water.
从太空看，地球是蓝色的。这是因为它大约71%的表面被水覆盖着。
▶引导状语从句的从属连词
英语中的状语从句共有九类，这些状语从句各有其引导词，有的引导词可以引导多种类型的状语从句。
1、引导时间状语从句
引导时间状语从句的从属连词主要有when、while、as、after、before、until/ till、since、as soon as、once等。
● When you came in, I was talking with a few boys.
你进来时，我正在和几个小男孩谈话。
● It started to rain while we were playing outdoors.
我们正在室外玩耍时，突然下起了雨。
● They laughed as they walked down the river.
他们沿着河一边走一边笑。
● After you finish this form, come to my office.
填完这张表后，来我的办公室。
● Don’t hand in your papers before you are sure there are no mistakes.
确保没有错误后再交试卷。
● Wait here until/ till I come back.
在这里等到我回来。
● I have lived in England since I was three.
自三岁后我就一直居住在英国。
● As soon as you feel sick, go to see a doctor.
一感觉不适你就要去看医生。
● Once you have made your decision, you shouldn’t change it.
一旦作出决定你就不应再改了。
2、引导地点状语从句
引导地点状语从句的从属连词主要有where、wherever.
● I live where there are mountains.
我住在多山的地方。
● You shouldn’t go where you are not asked to.
你不应该去不让你去的地方
● If you could go wherever you want to, where would you go?
如果你可以去你想去的任何地方，你会去哪里?
3、引导原因状语从句
引导原因状语从句的从属连词主要有because，since， as， now that 等。
● We have to go to bed now because we’ll start off early tomorrow.
因为明天一早就出发，所以我们现在就得睡觉
● Since you know all about it, tell me please.
既然你都知道，那就请告诉我吧，
● As all the seats were taken, I had to stand.
由于所有的座位都坐了人，我只好站着。
4、引导条件状语从句
引导条件状语从句的从属连词主要有if，unless，as/so long as等。
● If you see him, give him this note.
如果你见到他，就把这个便条给他。
● We won’t finish the work on time unless we work hard.
如果不努力，我们就不能按时完成这项工作。
● You can use my car as long as you return it before Friday.
你可以用我的车，只要周五之前还回来就行。
5、引导目的状语从句
引导目的状语从句的从属连词主要有in order that，so that， in case等。
● In order that we can arrive there on time, we should start off early.
为了能按时赶到那里，我们应该早出发。
● He played the piano very gently so that / in order that the baby could not be waken up.
为了不吵醒孩子，他轻轻地弹钢琴。
6、引导让步状语从句
引导让步状语从句的从属连词主要有although，though， as，even if，even though等。
● Though/ Although Canada is large, the population is small.
尽管加拿大面积大，但人口少
● He went to school though/ although he was very ill.
尽管他病得很重，但他还是去上学了。
● Even if / Even though we got a local guide, we still had some difficulty walking through the bush.
尽管我们找了一位当地的向导，但穿过灌木丛时还是遇到了一些困难。
7、引导结果状语从句
引导结果状语从句的从属连词主要有so…that…、such…that…、so (that)、so等。
● He was so careless that he forgot to write his name on the paper.
他如此粗心以至于忘了在试卷上写名字。
● Dalian is such a beautiful city that a great many people go there for holidays.
大连是个如此美丽的城市，很多人都去那里度假
● The teacher explained very clearly so that we all understood.
老师解释得非常清楚，我们都听懂了。
● My parents are waiting for me, so I must be off now.
我父母在等我，所以我现在必须得走了。
8、引导比较状语从句
引导比较状语从句的从属连词主要有 than， as等
● China has a larger population than India (does).
中国的人口比印度的多
● He speaks English as well as Americans (do).
他的英语说得和美国人一样好。
● Some people think that planes now are not so/ as safe as trains (are).
有些人认为现在的飞机没有火车安全。
9、引导方式状语从句
引导方式状语从句的从属连词主要有as， as if ， as though等。
● You should do as I do.
你应按我做的去做
● He treated the boy as if he were his son.
他对待那个男孩就像自己的儿子一样，
● He walked about as though he had lost something.
他到处走动着好像丢了什么东西似的。
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