虚拟语气表示和现在的事实相反，从句用一般过时，主句用 “should/would/could/ might +动词原形。例如 ：

　　If I had time， I would go for a walk.

　　If I were invited， I would go to the dinner party.

　　If I won a million dollars in the lottery， I would put it in the bank.

　　If I were you ， I’d wear a shirt and tie.

　　注意：在虚拟语气的句子中，be动词只能用were，不能用was。