非真实条件状语
① 表示与现在事实相反的情况：
主语+should/would/could/might+do+其他+if+主语+did/be(were)+其他
例：
1.If I were you,I would take an umbrella.
2.If I knew his telephone number,I would tell you.
②表示与过去事实相反的情况
主语+should/would/could/might+have done+其他+if+主语+had done +其他
例：
1.If I had got there earlier,I should/could have met her.
2.If he had taken my advice,he would not have made such a mistake.
③表示对将来情况的主观推测（可能相反或可能性很小）
主语+should/would/could/might+do+其他+if+主语+did/should/were to do+其他
例：
1.If he would come here tomorrow,I should/would talk to him.
2.If there were a heavy snow next Sunday,we would not go skating.
虚拟语气的其他用法
①、虚拟语气用在wish 后的宾语从句
②虚拟语气用在一想要(desire)一宁愿(prefer)二命令(order.command) 三建议(advise.suggest.propose) 五要求(demand.require.request.desire.insist)中,无论主句谓语动词为何种时态,从句的谓语动词都用：“should + 动词原形”或只用“动词原形”.
③表情绪.观点的形容词或名词也要用虚拟语气.如:necessary.important.impossible.natural.strange.surprising.
应该符合你的问题吧~
