Grammar(选修六第二单元语法)概要1.ppt

2). 非真实条件句 非真实条件句用语虚拟语气, 假设的情况不可能发生, 或者可能性很小, 其中if 是“要是、如果”的意思。即:“要是……就好了”; “如果……, ……就会……” 6. without和but for 构成虚拟。but for要不是 Without sunlight, people’s life would be different from today. But for your help, I wouldn’t have finished the work. Without your help, I would have failed. But for water, it would be impossible to live in the desert. 7. If only …要是就好了 If only I knew his name! If only we had followed your advice! If only I could see him again! 要是我们的父母能和我们住在一起就好了! If only our parents could live with us! 要是我没错过火车就好了！ If only I hadn’t missed the train! 8. It’s necessary/strange/natural/ important/pity/no wonder/impossible + that---Clause 从句中的动词要用虚拟, 即(should)+动词原形 It is important that we ( should ) master a foreign language. It is strange that she refuse to come to the party. It’s necessary that we should study hard. 9. 某些简单句的固定句型: Heaven help him! God bless you! May you succeed! Long live the People’s Republic of China! 10. need “不必做”和“本不该做”? didn’t need to do 表示: 过去不必做某事, 事实上也没做。 needn’t have done 表示: 过去不必做某事, 但事实上做了。 约翰开车去车站接玛丽, 所以她不必步行回家了。 John went to the station with the car to meet Mary, so she didnt need to walk back home. 约翰开车去车站接玛丽,所以她本不必步行回家了。 (Mary步行回家,没有遇上John的车。) John went to the station with the car to meet Mary, so she neednt have walked back home. There was plenty of time. She ____. A. mustn’t have hurried B. couldn’t have hurried　　 C. must not hurry　 D. neednt have hurried 典型例题 答案D。needn’t have done. 意为“本不必”, 即已经做了某事,而实际上不必要。 mustn’t have done 用法不正确, 对过去发生的事情进行否定性推断应为couldn’t have done, “不可能已经”。 must not do 不可以 (用于一般现在时) 三. 虚拟语气假设条件句型注意点: 1. 假设条件从句谓语动词发生的时间与主句所假设的谓语动词不一致, 叫做错综条件虚拟语气。主句和从句的谓语动词要依照假设的时间而定。 If the weather had been finer, the crops would be growing still better. If you had followed the teacher’s advice, you wouldn’t be in the hospital. 2. 假设条件虚拟倒装。 条件从句中有should, were, had三个助动词可以把if省略,并将这