Must Have to / Mustn't Don't have to

Modal Verbs
(Must, Have to, Don't have to, mustn't, should, shouldn't)

PRESENT

Should/ Ought to

This is a good film. You should definitely see it
You should try this delicious chocolate cake!

You should exercise regularly if you want to lose weight.

You shouldn't skip breakfast; it's important for your health.
If you want to be hydrated you ought to drink more water during the day.

The modal verb "should" is used to express advice, suggestions, expectations, or probabilities.

Example: "You should eat more vegetables to stay healthy."

• Meaning: It's a good idea to eat more vegetables.

Example: "You should try the chocolate cake—it’s delicious."

• Meaning: A polite way of suggesting something.

Open Ended

What are your suggestions?

Open Ended

Your best friend is going to make a presentation in front of the class and feels really nervous (stressed)?

What do you suggest?

Must vs Have to

We must save up some money if we want to buy our dream house.
Must I read the book?
I must finish the project today.

I have to go to work today.
Everyone has to be silent in a library.
We have to wear a uniform at school.

"Have to" mainly expresses general obligations (like rules) , while "must" is used for specific obligations (personal)

​Be careful ! They are affirmative sentences

Must I wear this tie?
Am I obliged to wear this tie? (What do you think?)

Do I have to wear this tie?
Am I obliged to wear this tie? (Is there a rule about ties?)

I don’t have to go to school tomorrow because it’s holiday.

You don’t have to study for tomorrow’s exam because it’s cancelled.

She doesn't have to buy that dress. She has plenty in her wardrobe.

Don't have to

You mustn't smoke on a train.

You mustn't park your car here. It's a -no parking -area.

Kate, you mustn’t tell anyone my secret. Please, promise!

Mustn't

Mustn't Vs Don't Have to

• Mustn't means that you should not do something. It’s not a good idea or it’s forbidden.

• Don’t have to means it is not necessary. You are not required to do something, especially if you don’t want to. (don't need to/ needn't)

Multiple Choice

If you are under 13 you _____ get your parents' permission.

• mustn't

• must
• don't have to

• have to

Multiple Choice

Whatever you do, you _____ touch that switch. It’s very dangerous.

• don't have to

• mustn't

• have to

• must

Multiple Choice

In Spain, teachers _____ work on Saturdays. They are free.

• must

• doesn't have to

• don't have to

• mustn't

MODAL VERBS QUIZ (MIGHT/MAY/SHOULD/OUGHT TO/ HAVE TO/ MUST/ DON'T HAVE TO/ MUSTN'T

Multiple Choice

I think I _________ fail the test, because I didn't study.

• should

• might

• must

• have to

Multiple Choice

It's wet and windy outside today. You ________ go out without an umbrella.

• mustn't

•     don't have to

•     shouldn't

•     won't

Multiple Choice

You ......................... wake up early tomorrow because it is Saturday.

• must

• mustn't

• should

• don't have to

Fill in the Blanks

Multiple Choice

Students ...................... follow the school rules.

• might

• have to

• has to

• mustn't