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什么是主将从现?请解释得通俗一点,

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什么是主将从现?
请解释得通俗一点,
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.