Step 4 Grammar
1. Presentation : Present a sign “No Rubbish”
.
Ask Ss “What can you see in the sign?” “What does the sign tell us?” “Can we throw rubbish in this place?”“Where must we throw the rubbish?” “What should we do if we cannot find a dustbin at once?”
T presents the following two sentences on the screen.
①We mustn’t throw the rubbish in the place with a sign“No Rubbish”, and we must throw the rubbish into the dustbin.
②We have to keep the rubbish in hand or in a plastic bag until we find a dustbin, if we cannot find a dustbin at once.
2. Get Ss to compare the two sentences above and explain how to use the modal verbs“must” & “have to”.
must is often used when you think that it is necessary to do something. have to is often used when someone else thinks it is necessary or there seems to be no other choice.
must is used to talk about an obligation that depends on the person speaking or listening, while have to is generally used to talk about obligations that come from “outside”.
must——subjective have to ——objective
e.g. I must be back by ten every night.( I think it is necessary for me to be back by ten every night.)
I have to be back by ten every night. ( I don’t want to be back by ten every night, maybe my mother thinks it’s necessary.)
3. Tell Ss in informal English, “have got to” can be used instead of “have to”. e.g. It is getting late, I’m afraid I have got to (=have to) go.
4. Forms in tense & Negative form
forms in tense: must, must have to, had to
negative form:
must——must not(mustn’t)(=not be allowed=be forbidden)
have to —— do not have to (don’t have to)(=needn’t)
e.g. It is a secret, you mustn’t tell others.
It is none of your business, I don't have to tell you about this.
Step 5 Practice
1. Look at the following table of greeting manners. Decide which are necessary and which are not. Make sentences using must, have to or negative forms.
Greeting manners
get off the bike when you greet someone salute
bow kiss on the cheek
nod hug
smile look into the eyes
take off your hat shake hands
Example: When you greet a friend who you know very well, you don’t have to shake hands.
If you want to make friends with someone, you have to smile more often.
2. Suppose you are spending the Spring Festival at your grandparents’ house. Complete the sentences with have got to.
1) Your school starts tomorrow, so you have got to go back today.
2) You broke your grandma’s favourite vase, so
3) Your parents went back to work three days ago, so
4) Your grandparents have give you quite a lot of money, so
5) You have done your homework all wrong, so
6) You do not know when you should go to school tomorrow, so
7) _______________________, so ______________________
8) ______________________, so________________________
Step 6 Discussion
Ask Ss to have a discussion of Dos and Don'ts at school, using the modal verbs: must & have to
Dos Don’ts
We must keep the classroom clean. We mustn’t jump the queue in the dining
hall.
We have to wear school uniforms We don’t have to use credit card in the every day. school store.
By Christine
Huipu High School
Feb. 1, 2004
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