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1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。 a. 与现在事实相反的假设 条件从句 主句 一般过去时（be用were） should（would）等 +动词原形 例如：If they were here， they would help you. 如果他们在这儿，会帮助你的。 含义：They are not here， they cant help you. b. 与过去事实相反的假设 条件从句 主句 过去完成时 should（would）等+ have+ 过去分词 例如：If he had come yesterday， I should / would have told him about it.如果他昨天来的话，我会把这件事告诉他的。 含义：He did not come yesterday， so I did not tell him about it. c. 表示对将来不大可能发生的事情的假想 条件从句 主句 一般过去时 should/would等 + 动词原形 were+ 不定式 should+ 动词原形 例如：If you succeeded， everything would be all right. 如果你将来成功了，一切都会好的。 If you should succeed， everything would be all right. If you were to succeed， everything would be all right. | 
