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Grammar B Using should and mustHow to look after your pet?Keep it clean.Brush its fur.Dont give her a shower.Dont pull its ears.You should keep it clean.You should brush its fur.You shouldnt give her a shower.You shouldnt pull its ears.How to look after your pet?Give it clean water. Change the water once a week.Dont give it too much food.Dont hold it in your hand.Dont put it in the sun.You should give it clean water.You should change the water once a week.You shouldnt give it too much food.You shouldnt hold it in hand.You shouldnt put it in the sun.Read the following situations and think about what youll say to them, using should and shouldnt.A. Simon was late for school this morning because he got up late. You should go to bed early.You should get up early.You should.You shouldnt be late again.B. On your way home, you saw a purse on the ground. You should give it to the police.You should wait for the owner. You shouldnt take it home.We use should and should not to give advice and to tell people what is the best or right thing to do.1. You _ do your homework carefully. Fill in the blanks:shouldSummary2. You _ give seats to the old people on the bus. 3. You _ speak to the old people loudly. 4. You _ sit on the table. It isnt polite.shouldshouldntshouldntDo some exercises:shouldntshould改同义句改同义句1. It is bad for your eyes to read in the sun. You _ read in the sun. 2. It is good for your health to exercise for half an hour a day. You _do exercise half an hour a day.1. 当别人需要帮助时当别人需要帮助时, 我们应当帮助他我们应当帮助他们。们。2. 你不应该花很多时间玩电脑游戏。你不应该花很多时间玩电脑游戏。We should help people when they need help.You shouldnt spend too much time playing computer games. 翻译翻译If you are reading in a library, what must you do and mustnt you do?keep quietkeep the books cleanI must (do)Discussionspeak loudlymake a lot of noisetake any food to the librarythrow rubbish take any books or magazines out of a libraryI mustnt (do)Is it necessary for us to wear sunglasses?Yes, you must wear them.Is it important to walk the dog every day?Is it important to take the dog to the park?Yes, you must walk it every day. No, You mustnt take the dog to the park. We use must and must not to tell people that it is necessary or very important to do or not to do something. We use “mustnt” to tell people that it is necessary or very important not to do something. Summary1. You _ put on your coat, its cold. 2. You _ do your homework first. 3. You _ spend too much time watching TV. 4. You _ play with fire.Fill in the blanks:mustmustmustntmustntDo some exercises1. Dont touch the dogs nose. You _ touch the dogs nose. 2. Its not necessary to feed goldfish too much. You _ feed goldfish too much.mustntmustnt改同义句改同义句1. 我们必须努力学习。我们必须努力学习。 We must study hard.2. 你必须把它还给我。你必须把它还给我。 You must give it back to me.3. 他们不可以从房间里拿走任何一本书。他们不可以从房间里拿走任何一本书。 They mustnt take any book out of the room.Translate sentences4. 我必须每天下午给我的鹦鹉喂食吗我必须每天下午给我的鹦鹉喂食吗? Must I feed my parrot every afternoon? No, you neednt.Differences between should and mustmust 比比 should 语气更强烈，语气更强烈，而而mustnt表示禁止做某事或不允许做某事表示禁止做某事或不允许做某事1. You _ bring your pet to school.2. They _ come earlier next time.3. You _ keep quiet in the library. 4. We _ spend too much time watching TV.mustntshouldmustshouldntFinish the sentences in part B1/Dogs like lots of exercise. You _ walk them in the park once a day if you want them to be healthy. If you dont have enough time, you _ get one.should notmustFish are good pets, but you _ give them clean water. You _ give them too much food. If you have a rabbit, you _ clean its hutch every day.shouldmustmust not Cats are friendly and you dont need to walk them. I think you _ get a cat.shoulda clean the cage/must/ once a week/YouYou must clean the cage once a week.B3 Rearrange the words and match the replies with letters:b You/at least once a day/should/take her out to the parkYou should take her out to the park at least once a day.24c You/a good cat brush/get/shouldYou should get a good cat brush.d get a dog/you/If your flat is very small/should notIf your flat is very small, you should not get a dog.e should/a bird or a goldfish/get/YouYou should get a bird or a goldfish.313f You/your dog/must/more often/walkYou must walk your dog more often.g the right way to look after birds/You /get a book/should/aboutYou should get a book about the right way to look after birds.42h brush your cats fur/should/every day/YouYou should brush your cats fur every day.1
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