雅思语法|在条件状语从句的虚拟语气是怎样的？

　　雅思语法|在条件状语从句的虚拟语气是怎样的？对于这块知识还不清楚的学生可以详细了解一下：

　　1. 用if条件从句表示的虚拟条件，是虚拟条件最普通的方式。

　　① 虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过去式 (be 一般用were)，主句用would/ should/ could/ might +动词原形。

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　　【句型结构】

　　If I were _____, I would/should/could/might do_______.

　　【练习指导】

　　Q: How to dispose garbage?

　　A: You know sometimes, people would litter around because they couldn’t find any trash can at hand. If I were in the position of my city’s mayor, I would invest a large sum of the city’s finance placing lots of trash bins along the roadside. Besides, I would carry out recycling programs and dispose of hazardous materials like batteries with far tougher standards. In a word, I think we just need to dispose of garbage in a safe and environmentally friendly manner.

　　② 虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时(即had+过去分词)，主句用would / should / could / might + have +过去分词。

　　【句型结构】

　　If I had done_____ before, I could have done____.

　　【练习指导】

　　Q: Describe a place you want to visit

　　A: If I had got enough time and money three years ago, I could have traveled to Santorini which is one of the most luxurious destinations in Greece.

　　2. 除了表示虚假条件外，if从句还可以表示对将来的推测，由于是将来还没有发生的，所以谈不上是真实的还是虚假的，只能说这个事情发生的可能性有多大。一般情况下，可以用陈述语气的if从句来表示对一个未来事实的推测，这个事实是完全可能发生的。

　　【句型结构】

　　If sb. were to / should + 动词原形，sb. would / should /could/ might +动词原形。

　　【练习指导】

　　Q: Will you buy perfume as a gift?

　　A: To be honest, giving others perfume as a gift is not that common with people I know. We prefer giving flowers or books instead because perfume seems to be kind of private. But it is really my mom’s favorite. If I should buy a bottle of Miss Dior for mom as her birthday gift, she might love it for sure.