can, must, have to

Employees can leave the building at lunch time.

     ‘We …………… stay in the building at lunch.’

• must

• don’t have to

• can't

Visitors must not / don’t have to smoke in the building.

• must not

• don’t have to

It’s a relaxed office – you must not / don’t have to wear a tie.

• must not

• don’t have to

I start at 10 am, so I mustn’t /don’t have to get up early.

• mustn’t

• don’t have to

Employees must not / don’t have to park in the customer car park. It is for customers only.

• must not

• don’t have to

If there is a fire, you must not / don’t have to use the lift. You must use the stairs.

• must not

• don’t have to

Employees must not use their computers to send personal emails.

      ‘We …………… use our computers to send personal emails.’

• have to 

• don’t have to

• can’t

Employees …………… use social media.

     ‘We can’t use social media at work.’

• must not

• must

• don’t have to

Employees …………… make local phone calls on company phones.

     ‘We don’t have to use our mobiles to make local calls.’

• can

• can’t

• must

Employees …………… wear a shirt and tie.

     ‘We have to wear a shirt and tie.’

• can

• must not

• must