主将从现什么时候用？
1、主将从现：如果主句是将来时或表示将来含义时，那么条件和时间状语从句多用一般现在时。
如： When I grow up, I will be a nurse and look after patients/ I want to be a nurse and look after patients.我长大后要当一名护士，照顾病人。
2、主祈从现：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。
3、主情从现：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。
扩展资料
其他从句用一般现在时的情况：
1、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：“Don'tclose the window if the rain stops,” she said.→She said not to close the window if the rain stops.她说如果雨停不要关窗户。
常见的时间状语从句的连词有：as soon as,when,while ,as,until等
2、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.如果明天天气好，我们将会出去。
3、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.我知到他如果有空肯定会帮我的。
主要标志有：if 、unless 、until、 when 、as soon as等
参考资料来源：百度百科-主将从现
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