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新概念英语第三册语法总结：虚拟语气
虚拟语气用来表达不可能或难以实现的愿望，与事实相反的假设，通常分为基本的三种形式。
1. 与现在事实相反的虚拟：
If + did / wer 第2页 /总页数 3 页
新概念英语第三册语法总结：虚拟语气
虚拟语气用来表达不可能或难以实现的愿望，与事实相反的假设，通常分为基本的三种形式。
1. 与现在事实相反的虚拟：
If + did / were + ..., ... would/ should/ could/ might+ do （动词原形）
If I were you, I would go abroad at once.(I am not you.)
If he knew it now, he could help me.(He doesn't know it now.)
2. 与过去事实相反的虚拟：
If + had done + ..., ... would (might) have done ...
If I had known your telephone number yesterday, I would have phoned you.(I didn't know your telephone number.)
If you had come here a little earlier just now, you might have met her.(You didn't come here earlier.)
3. 与将来事实相反的虚拟：
(1) If + should + v., ... would + v.（可能性很小）（译作“万一”）
If it should rain tomorrow, you could stay at home.
If I should fail, what should Ido?
(2) If + did / were to + v ..., would + v.（完全不可能）
If the sun were to rise in the west, I would lend you the money.
If you finished it in 3 minutes, I would give you my car.
4. 金牌特殊重点
［简单联想记忆］：
● 下列动词后的“宾语从句”中需要用虚拟形式，即should + 动词原形，shoud在美国英语中要省略（TOEFL语法考点）。此类常见的动词有：order, ask, decide, demand, require, recommend, suggest（建议）, insist（坚决要求）, advise, etc.
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He suggested that we (should) help them with English.
The teacher ordered that the homework (should) be finished within half an hour.
● 下列名词后的同位语从