“情态动词+have done”1.ppt

Grammar—“情态动词+have done”;回顾复习：; 情态动词可以用于不同时态，以must表推测为例： 1）must do 表示对现在或将来的情况的推测. e.g where is our monitor？ he must be in our classroom. 2）must be doing 表示对现在或将来正在进行的情况进行推测。 e.g　Put on more clothes,you must be feeling cold with only a shirt on. 　　3）must have done 表示对过去情况的推测。 e.g　The road is wet. It must have rained last night. ;情态动词+have done; 表示对过去事情的肯定推测，译成“一定做过某事”，该结构只用于肯定句。它的否定形式是cant/couldnt have done。 ;;3. There is no light in the room. Can they have gone out? 屋里没有灯光，他们可能出去了吗？; 表示对过去情况不肯定的推测，意思是“也许已经做了某事”，用于肯定句或否定句。;; 是虚拟语气，表示对过去事情的假设，意思是“本来能够做某事而没有做”。 ;五、 should+have+done ;1. I ought to have gone home last Sunday. 我理应上星期日回家。; 表示“本来需要做某事而没有做”。否定形式为“needn‘t+have+done”则表示“本来不需要做某事而做了”。;跟踪训练;2. Why did you keep it a secret from us ? We ____about it. A. should be told B. ought to have been told C. should have told D. ought to have told;3. —— Jack took the 8:30 bus to Guangzhou this morning. —— Really ? He ____ the 8:20 express . It is much more comfortable and faster to travel by train. A. could have taken B. would have taken C. need have taken D. must have taken;1.（2013陕西）The children lost in the woods; otherwise, they would have been at the lakeside camp as scheduled. A. must have got B. must get C. should have got D. should get ;2. The weather turned out to be fine yesterday. I _____ the trouble to carry my umbrella with me. (2006 江西卷) A. should have taken B. could have taken C. needn’t have taken D. mustn’t have taken; 3. I told your friend how to get to the hotel, but perhaps I ________ have driven her there. (2007 陕西卷) A. c