我来和你一起总结一下这类情况：
1.主句将来时,从句用一般现在时替换将来,如if,when,after,the minute等引导的时间、条件等状语从句中：
I'll tell her when she comes tomorrow.
I shall tell her the minute she gets here.
The next time you come,he will be a grown-up.
2.主句一般现在时,从句现在完成时,一般现在时强调现在的事实或结果
They tell me that you've agreed to it.
3.主句一般过去时,从句现在完成时,一般过去时强调未指明的过去时间
They told me that you've agreed to it.
4.定语从句中用一般现在时代替将来时,主句用一般将来时
He will give you anything you ask for.
Anyone who does it will get a gift.
5.一般现在时与一般过去时连用,因为时间点选取不同,一般现在时代表一种客观事实,一般过去时代表过去某一次的行为
As the city does not have many entertaining places to go,we treated the foreign friends to some real Chinese food.
6.一些特别的句型中主句用一般现在时主句用一般完成时It/This is ...that..
This is the first time that I've heard her sing.
This is the best movie that I've ever seen.
7.主句用过去时,从句用过去完成时
She said that she had never been there.
还有一些,由于时间选取的不同,会采取不同的时态来表达,平时遇到时多分析,积累.