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英语虚拟语气（一）：条件状语从句

本文主要是介绍英语虚拟语气（一）：条件状语从句，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

概念

条件状语从句使用虚拟语气时，要注意假设的时间，即现在、过去、将来。虚拟语气在条件状语从句中有三种变化，主句也有三种变化。

主句谓语变化规则：

  1. 过去时：should/would/might/could do
  2. 现在时：should/would/might/could have done
  3. 将来时：should/would/might/could do

从句谓语变化规则：

  1. 过去时：if had done
  2. 现在时：if did
  3. 将来时：if were to do / should do / did

对过去假设

If I had got there earlier, I should have met here.

If he had taken my advice, he would not have made such a mistake.

对现在假设

If I were you, I would take an umbrella.

If I knew his telephone number, I would tell you.

对将来假设

If he should come here tomorrow, I would talk to him.

If there were a heavy snow next Sunday, we would go skating.

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