e.g. He will write to me as soon as he gets to America.
他一到美国就给我写信。
When I see him , I will tell him this good news.
当我见到他时,我将告诉他这个好消息。
We wont leave until we finish our homework .
直到完成作业我们才会离开。
以if引导的条件状语从句假设的是将来的动作,主句用一般将来时,从句用一般现在时。
e.g. He will come to see me if he has time. 如果条件状语从句放在宾语从句中,时态则依照宾语从句的要求而变。
e.g. My mother said she would buy me a book if I studied hard.
我母亲说如果我努力学习,她要给我买一本书。
以because引导的原因状语从句不可能和so一起连用。
e.g. He didnt come to school yesterday because he was ill.他昨天没来学校,因为他生病了。
注意防止出现以下错误:
A. Im sure hell ring you up if he will come back.
从句时态错误,will come应该改为comes.
B. Because he was tired , so he went to bed very early.
中文习惯用因为所以,但在英语中because不能和so同时使用,应该去掉其中的一个。
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