虚拟语气表示一种不能实现的假设.ppt

If I how to swim, I trapped in this island. If the staff had been more careful, 主句与从句的动作发生在不同的时间, 这时主从句位于动词的虚拟语气形式因时间不同而不同, 这叫做混合条件句. If he got up early, I wish I were as tall as you. I wish every day were my birthday. I wish it would rain tomorrow. He behaves as if he owned the house. He talks about Rome as though hehad been there himself. 在句型 “It is important (necessary, strange, natural) that .... ” 中，that 后面的从句中的谓语动词用： should + 动词原形  [例句] It’s necessary that we should have a walk now. 我们有必要出去散散步。 It’s natural that she should do so. 她这样做是很自然的。 It’s important that we should take good care of the patient. 重要的是我们要照顾好病人。  1. if only 意为：若是...那该多好啊; 真希望...; 只要, 只要...就好 表示现在的情况,应用过去式; 如果是过去的情况,应用过去完成时态 If only I had arrived in time! If only she didn’t drive so fast. 2. It’s (high/right) time that… that 从句要用虚拟语气：过去时或should + do It’s time that you left/should leave here. 3. 一些介词短语, 如:but for(要不是), without, otherwise(否则), 等表示含蓄的条件,这时主句要用虚拟语气 Without your help, we would not have made such rapid progress. But for my brothers help, I would not have finished it on time. I had to do sth.more important,otherwise I might have helped. Alan ___ the party if he had gone to London. A. would have missed B. had missed C. would miss D. missed 2.—It was the drug，not the disease，that killed the boy. —He would be still alive today if he ________ that drug. A.not take??????????????????????? B.shouldn’t have taken C.didn’t take??????????????????? D.hadn’t taken 3. Simon looks as though he never ___ a square meal(吃得饱), though his parents feed him very well. A. get B. getting C. got D. should get 4. He is talking so much about America as if he ___ there. A. had been B. were C. was D. been 5. – Have you ever been to Beijing? -- No, but I wish I ___. A. have B. will C. do D. had 6.When a pencil is partly in a glass of water, it looks as if it ＿＿＿＿.