3. Should 、 ought to 、 must  You should clean the blackboard.  You ought to clean the blackboard.  You should not draw it on the blackboard.  You ought not to draw it on the blackboard.  You must be on time for class.  You mustn’t be late for class.

4. I have a tortoise. What must /mustn’t I do ?Could you help me? You must feed it. You must look after it. You must give it clean water. You mustn’t feed it too much. You mustn’t bring it to school.

5. I have a dog, what should/shouldn’t I do? You should /ought to play with it for some time every day. You should not/ shouldn’t/ought not to feed it at the table.

6. I want to get a pet but I don’t know what kind of pet to get.Please tell me something about them.

7. Please tell me something about dogs. Dogs like lots of exercise. You (1)______ walk them in the park once a day if you want them to be healthy.If you don’t have enough time, you 2)_____________ get one. must Should not /ought not to

8. I want to know something about rabbits. If you have a rabbit,You (3)__________clean its hutch every day. Should/ought to

9. What about fish ? I like fish. Fish are good pets but you 4)________give them clean water. You (5)________give them too much food. must must not

10. Look! The cats are very lovely. Cats are friendly and you don’t need to walk them.I think you (6)________ get a cat. Should/ought to

11. 1 、 My cat has very long fur. You can find its fur all over our flat.What can I do ? 2 、 I bought a parrot yesterday, but I do not know how to look after it. What should I feed it ? Do I have to clean its cage ? Can it talk ?

12. 3 、 I want to get a pet, but I do not know what kind of pet to get. I like dogs, but I live in a small flat and I am busy at work all day. What kind of pet should I get ? 4 、 My dog barks a lot. I cannot study because she makes too much noise. She has enough to eat and I take her out to the park every week. What do you think ?

13. Please put them in the right order.  a clean the cage/ ought to /once a week/ You  _________________________________  b You/ at least once a day/ should/ take her out to the park  __________________________________  c You /a good cat brush/ get /ought to  __________________________________  d get a dog /you /If your flat is very small/ should not  __________________________________ You ought to clean the cage once a week. You should take her out to the park at least once a day. You ought to get a good cat brush. If your flat is very small, you should not get a dog.

14.  e ought to/ a bird or a goldfish/ get/ You  __________________________________  f You /your dog/ must /out more often/ take  ____________________________________  g the right way to look after birds /You /get a book /should/ about  _____________________________________  h brush your cat /should/ every day/ You  ______________________________________ You must take your dog out more often You should get a book about the right way to look after birds. You should brush your cat every day. You ought to get a bird or a goldfish.

15. Let’s match the replies with the questions. 1 、 My cat has very long fur. You can find its fur all over our flat.What can I do ? You ought to get a good cat brush. You should brush your cat every day.

16.  2 、 I bought a parrot yesterday, but I do not know how to look after it. What should I feed it ? Do I have to clean its cage ? Can it talk ?  You ought to clean the cage once a week.  You should get a book about the right way to look after birds.

17.  3 、 I want to get a pet, but I do not know what kind of pet to get. I like dogs, but I live in a small flat and I am busy at work all day. What kind of pet should I get ?  If your flat is very small, you should not get a dog.  You ought to get a bird or a goldfish.

18.  4 、 My dog barks a lot. I cannot study because she makes too much noise. She has enough to eat and I take her out to the park every week. What do you think ?  You should take her out to the park at least once a day.  You must take your dog out more often.

19. Everyone makes mistakes.The most important is to correct our mistakes. 没有人不犯 错误，关键的是去认识错误并改正错误。或许你曾 经犯过这样那样的错误，但是羞于向你的老师、父 母或同学表白。或许你曾经发现你同学有些不良习 惯，但他却浑然不知，而你又没有勇气指出。现在 就让我们拿起笔借助于 should(not) 、 ought(not)to 及 must(not) 的帮助纪录下我们的心灵轨迹吧！  e.g. Mum,I should study hard.I ought not to play the computer games. I am very sorry. Chen Fei,you must finish your homework by yourself.

20. What have we learnt this class?  Learn to use should (not ) 、 ought (not) to and must \mustn’t.  Learn to how to look after some different kinds of animals.

21. Thank you! Good-Bye! Good-Bye!