如何掌握虚拟语气的用法

虚拟语气是一项语法难点，为了让学员们便于理解与记忆，我们把虚拟语气分成三大块来讨论：
　　1．名词从句中的虚拟语气 标志词+should+动词原形
　　2．条件从句中的虚拟语气 ①三种基本态 ②倒装虚拟句 ③混时虚拟句 ④含蓄虚拟句 ⑤跳层虚拟句
　　3．其它情形中的虚拟语气（wish/would rather/It’s high time…/If only…/lest）

　　一．三种基本形态（1）
　　表虚拟的时间 if从句谓语形式 主句谓语形式
　　现在： did / were would (should, might, could)+do
　　过去： had done/ had been would (should/might/could)+have done(been)
　　将来： were to/ should+do would (should, might, could)+do

　　三种基本形态（2）（这是基础，建议牢记下面的例句，争取能脱口而出）
　　与现在事实相反：If I had enough money, I would buy a book.
　　与过去事实相反：If I had had enough money, I would have bought a book.
　　与将来事实相反：If I were to have enough money, I would buy a book.
　　If I should have enough money, I would buy a book.

　　二、倒装虚拟句（只能与过去/将来事实相反，省去if，只有三种倒装形式）
　　Had I had enough money, I would have bought a book.
　　Were I to have enough money, I would buy a book.
　　Should I have enough money, I would buy a book.

　　三、混合时间虚拟语气（主要是抓住时间