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原因状语从句就是在复合句中表示主句动作发生原因的状语从句。用于引导原因状语从句最常用的连词是because,另外还有as, since以及now that等。
1. 用because引导:because是引导原因状语从句最常用的连词,其意为因为。如:
The little boy was crying because he was lost.
那小孩因迷路而哭。
I bought the house simply because it was large.
就是因为这所房子大我才买的。
2. 用as引导:as也可以用于引导原因状语从句,意思是由于。如:
As he is ill, he cant come to the meeting.
由于生病了,他不能来参加会议。
As you werent there, I left a message.
由于你不在那儿,我留了个信儿。
3. 用since引导:since引导原因状语从句时,意思是既然。如:
Since you ask, I will tell you.
你既然问,我就告诉你。
Since you are going, I will go.
既然你去,我也去。
4. 用now that引导:now that引导原因状语从句的意思也是既然。如:
Now that you have come you may as well stay.
既然你来了,你就留下。
Now that youre growing up you must learn to stand on your own two feet.
你既然已经长大成人,就得学会独立生活。
5. 习惯用法:不要受汉语意思影响将表示因为的连词与表示所以的 so 连用。如:
■既然你很忙,那就不必来了。
误:As you are busy, so you neednt come.
正:As you are busy, you neednt come.
正:You are busy, so you neednt come.
as是从属连词,在此引导原因状语从句;so 是并列连词,在此连接一个并列句,所以误句结构混乱,应去掉其中一个。
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