Unitat 18

Modals of possibility, obligation and prohibition

Modal verbs are used before ordinary verbs. They give additional information about the function of the main verb that follows it.

Contingut exercicis

They are used in order to indicate modality. They allow speakers to express certainty, possibility, willingness, obligation, necessity, ability. Here are some characteristics of modal verbs:

  • They never change their form. You can't add "s", "ed", "ing"...

He must works in the garden

He must work in the garden

  • They are always followed by an infinitive without "to" (e.i. the bare infinitive.)

They could to go to the beach

They could go to the beach

 

Below, a list of the modals of possibility, obligation and prohibition.

Possibility may It shows possibility in the future:

I may go to the cinema later.

might It shows possibility in the future. It is less formal than “may”:

Your keys might be in the car.

could It shows possibility in the future:

If we don't hurry we could be late.

can It is used to make general statements about what is possible:

It can be very hot in summer.

Obligation have to It shows that the obligation comes from somebody else. It’s a law or a rule and the speaker can’t change it:

Children have to go to school.

must It shows that the obligation comes from the speaker. It isn’t a law or a rule:

You must study for that exam.

Prohibition can't It shows that something is not permitted. It is against the rules:

You can't park your car in front of that door.

mustn't It is usually used when the prohibition comes from the person who is speaking:

You mustn't speak when the teacher is speaking.

 

 

Exercici 1

Respon a les següents preguntes per avaluar el que has après.

Exercici 2

Respon a les següents preguntes per avaluar el que has après.

Exercici 3

Respon a les següents preguntes per avaluar el que has après.