牛津版 七年级 (7B) Unit 6
Grammar B Using ‘should’ and ‘must’
How to look after your pet? Keep it clean. Brush its fur. Don?t give her a shower. Don?t pull its ears.
You should keep it clean. You should brush its fur. You shouldn?t give her a shower. You shouldn?t pull its ears.
How to look after your pet?
Give it clean water. Change the water once a week. Don?t give it too much food. Don?t hold it in your hand. Don?t put it in the sun. You should give it clean water. You should change the water once a week. You shouldn?t give it too much food. You shouldn?t hold it in hand. You shouldn?t put it in the sun.
Read the following situations and think about what you?ll say to them, using ?should? and ?shouldn?t?.
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 shouldn?t 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 shouldn?t 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. Fill in the blanks: 1. You ______ should do your homework carefully.
2. You ______ should give seats to the old
people on the bus.
3. You ________ shouldn?t speak to the old
4. You ________ shouldn?t sit on the table. It isn?t polite.
Do some exercises:
改同义句 1. It is bad for your eyes to read in the sun. You _________ shouldn?t read in the sun. 2. It is good for your health to exercise for half an hour a day. You ______do should exercise half an hour a day.
1. 当别人需要帮助时, 我们应当帮助他 们。 We should help people when they need help. 2. 你不应该花很多时间玩电脑游戏。 You shouldn?t spend too much time playing computer games.
If you are reading in a library,
what must you do and mustn?t you do? I must (do) keep quiet keep the books clean
I mustn?t speak loudly (do) make a lot of noise
take any food to the library
take any books or
magazines out of a library
Is it necessary for us to wear sunglasses? Yes, you must wear them.
Is it important to walk the dog every day? Yes, you must walk it every day. Is it important to take the dog to the park? No, You mustn?t 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 “mustn?t” to tell people that it is necessary or very important not to do something.
Fill in the blanks:
1. You ____ mustput on your coat, it?s cold. 2. You ____ must do your homework first. 3. You ________ mustn?t spend too much time watching TV.
4. You _______ mustn?t play with fire.
Do some exercises
改同义句 1. Don?t touch the dog?s nose.
You _______ mustn?t touch the dog?s nose.
2. It?s not necessary to feed goldfish
You _______ mustn?t feed goldfish too much.
1. 我们必须努力学习。 We must study hard. 2. 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。 They mustn?t take any book out of the room.
Must I feed my parrot every
afternoon? No, you needn?t.
Differences between ?should? and ?must? ?must? 比 ‘should? 语气更强烈，
而mustn’t表示禁止做某事或不允许做某事 1. You _______ mustn?t bring your pet to school.
2. They ______ should come earlier next time.
3. You ____ mustkeep quiet in the library.
4. We ________ shouldn?t spend too much time
the sentences in part B1
Dogs like lots of exercise. You ____ must walk them in the park once a day if you want them to be healthy. If you don?t have enough time, you _________ should not get one. /
If you have a rabbit, you ______ should clean its hutch every day. Fish are good pets, but you _____ must give them clean water. You ________ give them must not too much food.
Cats are friendly and you don?t need to walk them. I think you ______ should get a cat.
B3 Rearrange the words and match the replies with letters: 2 a clean the cage/must/ once a week/You You must clean the cage once a week.
4 b You/at least once a day/should/take her out to the park You should take her out to the park at least once a day.
1 c You/a good cat brush/get/should You should get a good cat brush. 3 d get a dog/you/If your flat is very small/should not If your flat is very small, you should not get a dog. 3 e should/a bird or a goldfish/get/You You should get a bird or a goldfish.
4 f You/your dog/must/more often/walk You must walk your dog more often. 2 g the right way to look after birds/You /get a book/should/about You should get a book about the
right way to look after birds.
1 h brush your cat?s fur/should/every day/You
You should brush your cat?s fur