B1U7 Modal verbs (must/have to)

You _____ learn to play an instrument if you want to be a professional musician.

• must

• have to

• both

Answer explanation

both options are possible!

Builders _____ to work in an office.

• mustn't

• don't have to

• both

Answer explanation

It is not prohibited, so 'don't have to' is correct

Doctors _____ tell secrets about their patients’ health.

• mustn't

• don't have to

• both

Answer explanation

It is prohibited, so 'mustn't' is correct

Do you _____ to wear a uniform in your job?

• must

• have to

• both

Answer explanation

We don't usually use 'must' in questions

People who work in banks _____ do a lot of paperwork.

• must

• have to

• both

Answer explanation

Both options are possible here

A firefighter _____ work in a team.

• mustn't

• have to

• has to

Answer explanation

we use 'has' for 'he, she. it' subject

An architect _____ be fit to do his or her job.

• mustn't

• doesn't have to

• both

Answer explanation

it is not prohibited, so we use 'doesn't have to'

My sister must _____ with the public in her job.

• deal

• deals

• dealing

Answer explanation

we use V1 (i.e. go, play, do) after modal verbs