步步高译林版高中英语必修4同课异构课件：Unit 2《Section Four Grammar and usage》.pptVIP

Unit 2 Sports events ;Grammar and usage ;情态动词没有人称和数的变化，有词义，但是不完整，不能单独做谓语，必须和不带to的动词不定式连用。;(1)He can run the 100m sprint in 11 seconds. (2)Can this little girl read before she goes to the primary school?;can/be able to;obligation;have to/must;2) must表示主观看法，have to则侧重于客观需要。如： We must be strict with ourselves in everything． In cities with many cars, some people have to wear masks． ;She might win a medal at the Olympics. She may be at home now. She could read and write at the age of 4. She should come to join us. She ought to/will/must help me whenever I am in trouble. ;can / could / may / might ;-- Will/Can/Could/Would you help me with my training? -- Yes, I will/can/can/will.;make suggestions;make offers;和其他时态的连用;must have done 的反意疑问句;shall可以用来征求对方意见。用于第一、三人称。此外它也可以用来表示说话人的命令、警告、允诺、威胁或决心等，这时它用于第二、三人称。如： Shall she go to the concert with us this evening？ (征求意见) You shall go to the front at once．(命令) Don’t worry．You shall get the answer this very afternoon．（允诺） He shall be sorry one day．I tell you．(警告) Nothing shall stop us from fighting against pollution．(决心) ;will在肯定句中表示意愿或决心时，是可以用于条件状语从句的。在疑问句中用于第二、三人称表示意愿。如： Will you go hiking with me in the mountain? Will he pay for me? If you will listen to me, I’ll give you some advice on how to learn English． If you will come this way, the manager will meet you．  ;mustn’t / needn’t;need / dare;用作实义动词时，可用于各种句式． We need to tell him the news. You don’t need to tell him the news. Do the flowers need watering? I didn’t dare to tell you the truth. Would you dare to catch the snake with your hand? The boy dares to do anything he likes.;Have a try!;1.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.--The room is so dirty.____ we clean it? --Of course. A.Will B.Shall C.Would D.Do;5.--I hear you’ve got a set of valuable Australian coins.___ I have a look? --Yes, certainly. A.Do B.May C.Shall D.Shou