英语，什么情况下主将从现，有哪些提示词 英语中，哪些情况要用到主将从现？
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as soon as,when,after,before\u7b49\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5
\u8868\u793a\u5c06\u6765\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u548c\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u662f\uff1a\u4e3b\u5c06\u4ece\u73b0
If it rains tomorrow, we won't leave.
常见的有以下四种情况：
一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时
如： When I grow up, I’ll be a nurse and look after patients
我长大后要当一名护士，照顾病人
二、如果主句是祈使句，那么从句通常要用一般现在时
如：Don’t laugh at me when I make a mistake.
我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时
如：You should be quiet when you are in the reading room
在阅览室时应保持安静
四. 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to....
如; She said not to close the window
常见的时间状语从句的连词有：as soon as,when,while ,as,until等
主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中，如果主句的时态是一般将来时，那么从句要用一般现在时。例如：
I will tell him about it when he comes.
If it is fine tomorrow, we will go outing.
如果主句的时态是过去将来时，那么从句要用一般过去时。例如：
He said that he would have another try if he had the chance.
I knew he could help me if he was free the next day.
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