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1、Unit 3 We should obey the rules Lesson 17 must用法,(1) 表示“必须，应该”，用must提问时， 一般不用mustnt回答，而用neednt回 答。 -Must I finish the work before dark? -No, you neednt. 我必须在天黑前完成工作吗？ 不，你没必要。,must的用法,(2) must not (mustnt)表示强烈禁止， 意为“不允许，一定不，不能，不可” （不要译为“不必”） You mustnt get to school late. 你上学一定不能迟到。,(3) must在肯定句中可以表示
2、“一定要， 一定是，一定会”等意思，即表示不 可避免性、肯定性、可能性、推定 或揣测等意思。 You must be tired after your long journey. 你走了这么远的路，一定很累。,辨析：must与have to,have to往往可与must互换，但两者的 意义和用法有些不同。 (1) must表示说话人主观看法；而 have to 强调客观情况迫使人不得不做某事。 (2) must只能表示现在“必须”，表示过去 的事情要用had to。have to有时态、 人称和数的变化。,(3) must与have to的否定意思不同。 比如： You mustnt do
3、that. 你千万不能做那件事。 You dont have to do that. 你不必做那件事。（相当于neednt）,课堂小测验,Individual activity,一、请找出下列各句中的错误并改正过来。,1. They have got lots of homeworks to do. 2. When you accept a present, you must use both hand. 3. You mustnt break anything. Its bad lucky. 4. There are so much people in the library. 5. It
4、was very different from a China wedding.,homework,hands,luck,many,Chinese,二、用所给词的适当形式填空。,1. Im too tired. Lets stop _(have) a rest. 2. He went to school without _(eat) breakfast this morning. 3. He couldnt wait _(eat) the cake. 4. Must I _(do) it now? 5. The window is broken. Try _(find) out who bro
5、ke it.,to have,eating,to eat,do,to find,Jim went to school without _ (have) breakfast. 2. Children mustnt _ (walk) across the road themselves. 3. Nobody can _ (drop) litter everywhere. 4. Henry and Alice will get _ (marry) in May.,三、 用所给动词的正确形式填空。,having,walk,drop,married,1. 鲁比怎样能洗掉溢出的牛奶？ How can Ru
6、by _ _ the spilled milk? 2. 我的父母总是在晚饭后打扫卫生。 My parents always _ _ _ after dinner every day. 3. 英国和加拿大的天气不一样。 The weather in England is _ _ that of Canada.,四、根据汉语意思完成句子。,wash up,do some cleaning,different from,4. 在中国你必须用双手接受礼物。 In China you must use _ hands _ _ a present. 5. 影迷们冲上前去与这位电影明星 握手。 The fa
7、ns rushed forward to _ _ _ the film star.,both to accept,shake hands with,Complete the passage with the words. accept; drop; open; put; ride; show; take; take off; wear; bicycle; hair; litter; photos; shoes; waste bin In Britain you cant (1) _ on the pavement. People cant (2) _. They must (3) _ it i
8、n the (4) _. Children can (5) _ when they go into someones house, but adults wear their shoes in the house. British women can (6) _, although many people (7) _ a hat when its cold. In Britain you can (8) _ of people. You can (9) _ a present with one hand. You can (10) _ a present immediately on your
9、 birthday.,ride your bicycle,drop litter,put,waste bin,take off shoes,show hair,wear,take photos,accept,open,Look at the signs and guess what they mean .,Around the word Signs around the world .,Make notes on what you must , mustnt or can do . 1. What must you wear ? 2. What mustnt you ask ? 3. What presents must you bring ? 4. What presents mustnt you give ? 5. What mustnt you do in the streets ? 6. What must you do when you visit someone at home ?,Thank you!,
