雅思备考之雅思语法if条件状语从句的虚拟语气详解

　1.用if条件从句表示的虚拟条件，是虚拟条件普通的方式。

　　①虚拟现在时表示与现在事实相反的设，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。

　　【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.