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.

Free tutorial Must or should. English Must or should exercises. English grammar easy to learn.  英语在线练习. Exercícios das aulas de Inglês grátis online, exercícios de vocabulários, gramática inglesa.