主句是过去式从句用什么时态
1.主句用一般现在时，从句可用任意时态，可归纳为“主现从不限”；2.主句用过去时，从句用过去某个时态，可归纳为“主过从四过”；3.主句用过去时，从句是科学真理、客观常识、名人格言时用一般现在时；4.情态动词could/would用于“请求”，表示委婉、客气的语气时，从句不受主句的约束。由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。
注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，祈使句或情态动词，从句要用现在时态,[主将从现原则]（主将从现，将并非指将来时，还指表示将来含义的，跟着if后的那句话是从句。
语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如：
1）If you ask him,he will help you.
如果你请他帮忙，他会帮你的。
2）If you fail in the exam,you will let him down.
如果你考试不及格，你会让他失望的
if引导的条件状语从句既可以将从句放前面也可以将从句放后面
（如果天下雨，我们就不玩了）If it rains,we will stop playing.
转为We will stop playing if it rains.
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