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）
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
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.
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.
If I had studied English at school, I could read the English novel now.
If she were not so careless, she wouldn’t have made such a mistake.
What would I have done without you?
But for their help, I would not have finished the task.
But that the doctor arrived on time that day, they would have been dead.
Given more time, I would have been able to finish the test.
五、跳层虚拟句(即句子一半为虚拟，另一半为陈述语气；but前句用虚拟而or/otherwise后句用虚拟） (but) He would put on weight, but he doesn’t eat much. (与现在事实相反)
He would have put on weight, but he didn’t eat much. (与过去事实相反)
(or, or else, otherwise) I forget where I read the article, or I would show it to you now. (与现在相反)
Mary couldn’t have received my letter, otherwise she would have replied before now. (与过去相反)
六、名词从句虚拟语气(1) ask, advise, beg, command, demand, decide, desire, insist, order, prefer, propose, require, recommend, request, suggest, urge等表示命令、要求、建议等含义的动词后的宾语从句中，谓语动词用(should)+动词原形, eg. I suggest / suggested that we (should) go tomorrow.
名词从句虚拟语气(2) It is +(形容词/过去分词/特定名词)+that的从句中，形容词主要是表示令人吃惊的、重要的、必要的、关键的等词汇。形容词：astonishing, amazing, advisable, appropriate, crucial, desirable, essential, important, imperative, keen, necessary, natural, normal, odd, proper, preferable, strange, sorry, shocked, surprising, urgent, unusual, vital等。
名词从句虚拟语气(3) 过去分词：decided, desired, demanded, ordered, requested, recommended, suggested等;名词：advice, decision, desire, demand, suggestion, motion, pray, resolution, wish, preference, proposal, recommendation, requirement, idea, order等
I wish I knew the answer.(与现在事实相反)
I wish I had known the answer. (与过去事实相反)
I wish you would shut up. (与将来事实相反)
If only I were taller. (与现在事实相反)
If only he had followed your advice! (与过去事实相反)
If only the rain would stop. (与将来事实相反)
It is (high/about) time…
It is time you thought about your future.
I would rather you didn’t speak rudely to her. (与现在事实相反)
I’d rather you hadn’t spoken rudely to her. (与过去事实相反)
Lest…, in case…, for fear that…（引导的是目的状语从句，(should)+动词原形）
eg. He took his umbrella lest it should rain.
2. 一般过去时：wish/If only…/would rather/It’s time (high/about) that….