Thai Thuy Group- Teaching grammar in context
Topic : Modal verbs (must , have to, should – unit 2: language – grade 11)

I.Presentation
Teacher asked sts to observe 5 pictures showing signs in the park or in the
museum and make sentences by using suggestions and the model sentence
given by the teacher .

Eg: You must put rubbish in the proper bin
Eg: You mustn't pick up flowers in the park.

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Suggestions :
- not / litter / in the park
- put rubbish in the proper bin
- not/pick up flowers in the park.
- not /step on the grass in the park
- not/ touch the items in the museum

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Suggested answers
You mustn't litter in the park
You must put rubbish in the proper bin
You mustn't pick up flowers in the parks
You mustn't drink alcohol in the park
You mustn't smoke in the park
You mustn't touch items in the museum.

II.Attention
• -Teacher asked sts to give the form of the use of modal verbs (should, must, have
to ) based on the modal verbs in presentation pattern and the teacher's examples.
• Eg: It is raining hard outside . You have to wear a raincoat.
• Eg: Nam doesn't have to go to school today because today is Sunday.
• + We use should most commonly to talk about what is the ideal or best thing to do
in a situation.
• +We often use should to give advice and make suggestions.
• +Must expresses strong obligation and necessity. We often use must with more
general references to the future, particularly when talking about obligations that
come from the speaker
• + We use must not to talk about what is not permitted
• + We generally use have (got) to when we refer to obligations that come from
outside the speaker.
• Form : S + should, have to/ has to, must + V (bare infinitive)

III.co-constructor
• -Teacher told sts to do the exercise in the text book in order to practise .
Task 1 : Circle the correct answers to complete the sentence.
1. You must/mustn't respect older people. You can learn some valuable lessons from them.
2. We don't have to/have to wear uniforms on weekdays. It's the rule at our school.
3. You should/mustn't ask your parents for permission if you want to colour your hair.
4. In the past, women had to/must do all house work. It was one of their duties.

Answer key :
1. You mustrespect older people. You can learn some valuable lessons from them.
2. We have to wear uniforms on weekdays. It's the rule at our school.
3. You should your parents for permission if you want to colour your hair.
4. In the past, women had to do all house work. It was one of their duties.

-With a view to consolidating , teacher can give sts extra exercise.
• + Extra exercise : Multiple choice
• Question 1: They will _______ pay a visit to their parent house. They haven't seen each other for 11
months.
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A. should B. must
C. have to
D. need
• Question 2: You _______ talk to your grandparents rudely like that, Tommy!
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A. couldn't B. don't have to C. mustn't D. may not
• Question 3: I _______ clean the house before my mother comes home, otherwise, I will get
punished.
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A. should
B. had to
C. must
D. can
• Question 4: My father _________ go to the office at the weekend.
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A. should not
B. doesn't have to C. must not
D. has to not
• Question 5: I think your parents ________ move to Ninh Kieu, Can Tho because Ho Chi Minh city is
too crowded.
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A. have to B. must
C. should D. has to

Suggested answer
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+ Extra exercise : Multiple choice
Question 1: They will _______ pay a visit to their parent house. They haven't seen each other
for 11 months.
A. should
B. must
C. have to
D. need
Question 2: You _______ talk to your grandparents rudely like that, Tommy!
A. couldn't
B. don't have to
C. mustn't
D. may not
Question 3: I _______ clean the house before my mother comes home, otherwise, I will get
punished.
A. should
B. had to
C. must
D. can
Question 4: My father _________ go to the office at the weekend.
A. should not
B. doesn't have to
C. must not
D. has to not
Question 5: I think your parents ________ move to Ninh Kieu, Can Tho because Ho Chi
Minh city is too crowded.
A. have to
B. must
C. should
D. has to

IV.Extension
-T told sts to observe the pictures describing things that children should do or mustn't do at home
by using suggestions and examples given by the teacher.

Suggested phrases:
Should

Shouldn't

-clean the house

-smoke cigarettes

-do the washing-up

-drink wine or beer

-water the trees

-go home late

- Do the laundry

-use your parents ' cellphones
without permission

-help parents cook

- Stay up late

-look after their younger
bothers/ sisters when their
parents are busy
Eg : + we should help our parents do housework in our free time.
+We mustn't drink wine or beer.

Then teacher told sts to make a dialogue based on the suggestions , examples and
the model given.

The model 1 :
A: what should we do to help our parents at home / (when we have free time)?
B: We should …………………………………
The model 2
A: Can you tell me about your family rules ?
B: In my family,I have to be back home by 9 p.m. There are some things that we
are not allowed to do . For example , we mustn't……………
A: Really? I don't have to. But my parents think I shouldn't stay out after 10 p.m.