First and Second conditionals.ppt

Grammar Mixed Conditionals 混合条件句 designed and made by Yuenteng Yeung 虚拟条件句 虚拟条件句，也称非真实条件句，如果表示的条件根 本不可能发生，或实现的可能性很小，要用虚拟条件句。 现在的事实相反:if从句用一般过去时（did / were），主句用would / could / should / might + do，表示现在不可能发生的事情。 1)If Princess Diana were alive today, she would be happy to see her son, Prince William’s wedding. 如果戴妃还在生，她会很高兴看到自己儿子的婚礼。 2)If I were you, I wouldn’t be so proud. 我要是你的话，我不会如此骄傲。 3)If she knew you were there, she wouldn’t say that. 如果她知道你在那里，就不会这样说。 2.与过去的事实相反: if从句用过去完成时（had + done），主句用would / could / should / might + have + done, 表示过去不可能发生的事情. 1)If he had taken my advice, he would not have made such a mistake. 如果他之前听从我的劝告，就不会犯这样的错了。 2) If I had got there earlier, I would have met her. 如果我早点到那里，我就能见到她了。 3)If I hadn’t been a teacher, I would have been a doctor. 如果我当时不做老师，就会是个医生了。 4)If I had known this computer program, a huge amount of time and energy would have been save. 如果我早知道这个电脑程序，就能省大量的时间和精力。 3.与将来事实相反: if从句用were to do/should+ do/did , 主句用would / could / should / might + do 1)If you should succeed, everything would be all right. 如果你将来成功了，一切都会好的。 2)If the school were to have many foreign teachers, students could improve their English more easily. 如果学校将来有更多的外籍教师，学生更容易改善自己的英语水平。 从句 主句谓语 与现在事实相反： should did would +动词原形 could might 虚拟条件句的倒装 虚拟条件句的倒装部分如果含有were, should, 或had, 可将if 省略，再把were, should, had移到从句句首，成为倒装。 1. If it had rained last night, it would be very cold today.= Had it rained last night, it would be very cold today. 2. If I were to have a baby, I would be a great mommy.= Were I to have a baby, I would be a great mommy. 3. If you should have any questions, you would feel free to ask me.= Should you have any questions, you would feel free to ask me. 隐