Question

3 *** Complete the second sentence so that it has the same
meaning as the first. Use have to / must, don't have to, mustn't,
had to and didn't have to.
School uniform is compulsory at my school.
We have to/must wear school uniform at my school.
1 It was necessary to study for my exams last week.
2 Do not use your mobile phone during the film.
You
3 It's not necessary for them to get the bus.
They
4 Please be silent in the library.
People
5 Our school Geography trip was voluntary.
We
6 She needs to practise every week before the concert.
She

Answer 1

Respuesta:

1. Must
2. Have to
3. Have to
4. Must
5. Have to
6. Must

Explicación: Recuerda que el must es para cosas que debes hace obligatorio y have to para cosas que no se debe hacer obligatorio. Saludos.