OBLIGATION
Should – Use for advices and probability - Example: You should go outside, it’s a beautiful day.... – I
should be at home by 8:00 pm.
Must – Use for obligation – ( about subjective , personal opinion; also to express something
forbidden) – I must see a doctor, I have a terrible headache.. He must not play with toys in this place.
Have to Use for obligation – (about objective , external things.) In England, Peter has to drive the car on
the right side.
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You _________ wake up early to go to school.
They ________ visit the downtown museum.
We ________obey the rules to live in peace.
I ________ study more to get a better grade.
She _________ move somewhere else, she doesn’t like the town.
He ___________ quit cooking classes, he is such a bad cook!
You _________ know about the rules of the game.
We _________ not smoke here.
I _________lose weight. I’m too fat
Students _________ practice exercises many times to get good at learning a language.
We ________be careful while we are walking on the street.
I’m tired. I _____________ go to bed early.
John _____________go to school on Saturdays.
We ______________ get another dog soon.
This is a great book. You _____________ read it.
A soldier _____________ obey the orders.
We _____________ go to London for meeting.
I think we _____________ pay in advance.
You really _____________ visit us soon.
You_____________ try to spend more time at home.
Mustn't do - Prohibition
The negative form of 'must' expresses the idea that something is prohibited - this form is very different in
meaning than the negative of 'have to'!
Examples
She mustn't use such horrible language.
Tom. You mustn't play with fire.
You mustn't drive more than 25 mph in this zone.
The children mustn't go into the street.
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It is forbidden. You ______ do that.
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You ______ ask my permission. You can do what you want.
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You ______ speak to the driver when the bus is moving. It's dangerous.
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Help yourself to anything you want. You ______ ask.
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You ______ park here. There is a double yellow line.
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Pay me back when you can. You ______ do it immediately.
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It's optional. We ______ to go if you don't want to.
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I'll tell you a secret. You ______ tell anybody else. Promise?
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Whatever you do, you ______ click with the right mouse button or the program will crash.
10. Be on time. You ______ be late or we will leave without you.
11. He's a millionaire. He ______ work but he does because he enjoys it.
12. I like Saturdays because I ______ go to work.
13. This is very important. You ______ forget what I said.
14. It's very informal here. You ______ wear a tie unless you want to.
15. The train is direct. You ______ change trains.
'Don't have to' is used to express that something is not required.
'Mustn't' is used to express that something is prohibited.
Don't have to do - Not Required
The negative form of 'have to' expresses the idea that something is not required. It is however, possible if so
desired.
Examples
You don't have to arrive before 8.
They didn't have to work so hard.
We don't have to work overtime on Saturdays.
She didn't have to attend the presentation.
16. In boxing, you ______ hit your opponent below the belt.
17. I ______ wear a suit at work on Fridays. It's 'dressing down day".
18. In athletics, you ______ start before the gun is fired.
19. In bridge, you ______ look at other people's cards.
20. You ______ be mad to work here but it helps.