FORM USES

HAVE TO - MUST- SHOULD

Esther Martínez

- Modal verbs are followed by an bare INFINITIVE.

You must go to the doctor.

- We use “not” to make them negative.

She shouldn´t leave now.- We use subject-verb inversion in the

interrogative.

Do I have to go to school today?

LET´S RECAP: FORM

We use “HAVE TO” and “MUST” to talk about obligation.

We have to go.

We don´t have to go.

Do we have to go?

HAVE TO and MUST

We use “MUSTN´T” to express prohibition.

You mustn´t use your phone at school.

MUSTN´T

We use “SHOULD” to give suggestions and advice.

You should go to the doctor.

SHOULD