Cap. 13

Modals: Obligation

must · have to · should · mustn't vs don't have to

Ejercicio 1

Elige la opción correcta

6 puntos

Selecciona la forma modal adecuada según el contexto.

You don't have to / mustn't use your phone in the library.

We don't have to / mustn't hurry. We have plenty of time.

You don't have to / mustn't answer the phone while driving.

Don't you think we should / must call mum to say we'll be late?

A fireman has to / should wear a uniform when at work.

You shouldn't / mustn't go out in the rain without an umbrella.

Ejercicio 2

Corrige los errores

5 puntos

Cada frase tiene un error en la parte subrayada. Escribe la forma corregida.

I must go to work by bus yesterday. My motorbike was being repaired.

You don't look well. You should to go home.

My father is a taxi driver and he should work nights. (It's part of his job.)

You don't have to play football here. It says no ball games.

People mustn't use their phones when they are talking to you.