If I were you，I would choose that picture.
If you had taken my advice，you would not have made such a mistake.
If there were a sunny day next Sunday，we would go hiking.
1.在for fear that，in case，lest引导的从句中，若用虚拟语气时，从句谓语为：(should) + do。
eg. He started out earlier in case he (should) be late.
2.在so that，in order that所引导的目的状语从句中，从句中的谓语为：can / could / may / might / will / would /should + do。
eg. He goes closer to the speaker so that he can hear him clearer.
1. should + 原形动词,表现在或将来
eg. He was angry that you should call him by name.
2. should + 完成式, 表过去
eg. I’m very sorry that you should have failed the test.
虚拟语气常用于as if, as though 引导的方式状语从句：
eg. They began to talk warmly as if they had known each other for long.
They stopped talking as if someone should come.