新人教版,英语必修三, unit 1 grammar.ppt

Unit 1 Festivals around the world Learning about language 情态动词主要表达说话人的看法、态度 等。从用法上来说，有这样几个特点： 一是情态动词自身都有一定的意义， 但不能表示正在发生或已经发生的 事情，只表示期待或估计某事发生。 二是情态动词除ought和have外，后 面必须接不带to的不定式。 三是情态动词没有人称和数的变化, 也没有非谓语形式。 1) 表示请求、建议等, would比will委婉 客气。 　Would you pass me the book? 2) 表示意志、愿望和决心。如： 　I will never do that again. 　They asked if we would do that again. 5. shall, should 1) 在一、三人称的疑问句中, shall用来 询问对方的意愿。如： Shall we begin our lesson? When shall he be able to leave the hospital? 2) 用于二、三人称的陈述句中, 表说话人 命令、警告、允诺等口吻。如： He shall have the book when I finish reading. You shall do as I say. 3) should表示劝告、建议、命令, 其同义 词是 ought to; 在疑问句中, 通常用 should 代替 ought to。如： You should go to class right away. 4) should/ought to have done 过去应该 做的事情而没有做, 表责备。如： — You should have written with a pen, not a pencil. — Yes, I know I ought to have, but I had no pen to write with. 5) should / ought not to have done 过去不应该做的事情却做了, 表责备、 悔恨情感。如： I was really anxious about you. You shouldn’t have left home without a word. I’m not feeling well in the stomach, I shouldn’t have eaten so much fried chicken just now. 6) needn’t have done 过去本不必做的 事情实际上却做了。如： You needn’t have told him that. 4. Some people who don’t like to talk much are not necessarily shy; they ___ just be quiet people. (2009安徽卷) A. must B. may C. should D. would 5. One of the few things you ____ say about English people with certainty is that they talk a lot about the weather. (2009北京卷) A. need B. must C. should D. can 6. He did not regret saying what he did but felt that he _____ it differently. (2009江苏卷) A. could express B. would express C. could have expressed D. must have expressed 11. It ____ have been Tom that parked the car here, as he is the only one with a car. (2009上海卷) A. may B.