Grammar 情态动词.ppt

Grammar 情态动词 shall 1.shall 用于第二、三人称陈述句中，表示说话人给对方的命令，警告，允诺或威胁。 1)You shall go with me.(命令) 2)You shall have the book when I finish it.(允诺) 3)He shall be punished.(威胁) 2. shall用于第一、三人称疑问句中，表示说话人征求对方的意见和向对方请示。 4)Shall we begin our class?（征求意见） 5)When shall Mike be able to leave hospital?(请示) 3.用语条约，规定，规章等文件中，表示一种义务，多用于第三人称中。 6) “The interest ___be divided into five parts, according to the agreement made by both sides.” declared the judge. A. may B. should C. must D. shall must, mustn’t 1.must用于肯定句中表示“必须” ---- Must I hand in my exercises now? ---- Yes, you must. (No, you needn’t.) 我必须现在交练习吗？是的，必须。（不，你不必） 2.Must用语肯定句中表示“偏偏”。 Naturally, after I told her what to do, my daughter must go and do the opposite. 自然地，在我交代女儿做什么之后，她偏偏要做相反的事情 3.mustn’t表示“禁止” You mustn’t play in the street. 你不能在街上玩耍。 used to 和would的区别 1.在表示过去重复的习惯时， used to可用would代替。例如： He would take a walk near the forest in the evening.以前，他晚间常在森林附近散步。 He used to take a walk near the forest in the (而现在已经不在那里散步了) 2.used to 强调过去的行为同现在的对比，含有“过去怎样而现在却不这样了”的意思；而would则单纯表示过去的习惯性动作，常和often, everyday等连用。例如： She isn’t what she used to be.她跟过去不一样了。（表示对比，不可用would） We would sit in the yard every evening and listen to his story.我们每天晚上坐在院子里，听他将故事。（表示过去的重复行为） 3.表示过去的状态，只能用 used to，不可用would。例如： There used to be a park.以前这里有一个公园。 巩 固 练 习 1.---Wrtie to me when you get home. ---I ________. A. must B. should C. will D. can 2.A left-luggage office is a place where bags ___ be left for a short time, especially at a railway station. A.should B. can C. must D. will 3.---Excuse me, but I want to use your computer to type a report. ---You___ have my computer if you don’t take care of it. A.shan’t B. might not C. needn’t D. shouldn’t 4.Why ____ he think like that? I ____ believe it. A.should; won’t B. should; can’t C. would; won’t D. could; can’t 5.____ she use the computer in the office? ---Yes, please. A. Will B. Would C. Can D.Shall Must+do/be doing 可以对现在、现在进行的情况进行肯定的推测 1.Judging from h