Must or should rules, examples

Must - mustn't

Must + infinitive = it is necessary to do something. For past tenses use had to.

positive - must
I must stop the car.
You must stop the car
He / She / It must stop the car.
We must stop the car.
You must stop the car.
They must stop the car.

negative - mustn't
I mustn't stop the car.
You mustn't stop the car
He / She / It mustn't stop the car.
We mustn't stop the car.
You mustn't stop the car.
They mustn't stop the car

Mustn't (must not) + infinitive = it is necessary not to do something.

Must examples

Dad must cut the gras. It's too long.
The pupils must learn vocabulary. They'll write a test.
She must go to the hospital. She's ill.
The car is damaged. You must repair it.
You mustn't touch the oil painting.
Must I look for the children?

Should - shouldn't

Should + infinitive = it is the right thing to do.

positive - should
I should see the doctor.
You should see the doctor.
He / She / It should see the doctor.
We should see the doctor.
You should see the doctor.
They should see the doctor.

negative - shouldn't
I shouldn't see the doctor.
You shouldn't see the doctor.
He / She / It shouldn't see the doctor.
We shouldn't see the doctor.
You shouldn't see the doctor.
They shouldn't see the doctor.

Shouldn't (should not) + infinitive = it is not the right thing to do.

Should examples

The train should be on time.
You shouldn't watch the film.
I think you should do your homework.
It's too late. I think you shouldn't do your homework now.
Do you think I should do my homework?

Must or should examples

Must or should with explanations, examples and exercises. Change the following sentences into Must or should and learn with English online exercises.

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