3．　 Daniel becomes___________(interest) in pets.

2．　 Can you find the ____________(different) between the twins.

1．　 The clever girl can work out the problem______________(easy).

1.‘must’ 的三种用法:

　 (1)指做某事非常有必要或很重要,侧重指主观意愿,否定回答用

needn’t.(如果表示受客观情况所逼,不得不做某事,常用‘ have to’.)

我今天必须做完家庭作业吗?不,不必了./是,必须.

_______ I finish my homework today?No,you______./yes,you_____.

你不得不呆在家,因为天在下雪.

You _______　 _______stay at home because it is______.

　　 (2)must not/mustn’t表示“ 不允许”.

你千万别玩火.You ______　 ______　 _______　 fire.

红灯时,你千万不能穿马路.

When the traffic lights are　 red,you ______　 ______　 the road.

　　 (3)表示肯定的揣测,“准是,肯定是”,否定式为‘can’t’.

那个人是谁?一定是我们校长.不可能是他,他去北京了.

Who’s that man?it ______　 ______ our headmaster.

It ______　 _______him. He has gone to Beijing.

Extension activity　

Ask more able students to come up with their own advice to the pet owners .Tell them to choose two things you should (not)ought (not) to do when you own a pet. They then write sentences giving instructions. Ask students to read out their advice to the class.

9. Divide the class into groups of four .one group comes to the front of the class and each member reads one letter at a time .

A representative from another group responds by reading his/her advice. You could turn this into a competition. If the sentence is correct ,the group wins a point .If not ,the chance goes to the next group. Students correct their own sentence.

We use ‘should’and ‘should not/shouldn’t’to give advice and to

　tell people what is the best or right thing to do.’ought to’and

　‘ought not to/oughtn’t to’have similar meanings.

( 但 前者隐含了个人的观点,因此语气稍弱;后者语气稍强,常用于指

外部强加的法律或规定.)

　　　 We use ‘must’ to tell people that it is necessary or very important to do something.We use ‘must not/mustn’t’to tell people that it is necessary or very important not to do something.

(‘Must’语气最强,表示某件事完全必要.)

8. In Part B3, students can read some of the answers which give advice to　 the writer of each letter. students check answer s with a partner.

7. Ask students to read the four letters in part B2 carefully. Make sure that they understand the messages well. Ask them remember and to check the words in their dictionaries.

6. Use class feedback to identify any misunderstanding ,as they involve the use of negative forms.

Extension activity

Depending on the general ability of your class, this could be done at the end of this section to consolidate students’ understanding .Elicit statements from students using different modals to talk about a situation ,e.g.,

A new student is joining the class .Ask what instructions can you give the new student? e.g.,

You must arrive at school at 8.10 in the morning.

You ought to walk slowly on the stairs .

You should hand in your homework to the monitor.

The class has to choose a class monitor .Ask

What are his/her duties?e.g.,

He /she must collect the exercise books .

He/she should make sure that students follow the school rules.

5. In part B1,the Beijing Sunshine Secondary School students give instructions about looking after pets. Each point of the notes on the left describes the degree of necessity for the instruction next to it on the right.

Read the notes to the class . Then divide the class into pairs and ask students to complete the instruction　 on the right. Encourage students to check the example sentence on pages 95 and 96 to identify the correct modal word to fit each instruction .

4. Explain to students that ‘must’ is the strongest word , expressing the sense that something is a absolutely necessary .