1.  You ______ pay — it's free for students.

2.  You ______ touch the exhibits — it says 'Do not touch'.

3.  I ______ finish this report before 5pm — my boss wants it.

4.  You ______ bring food — the hotel provides all meals. (sem obrigação)

5.  Doctors ______ keep patient information confidential. (obrigação — regra)

6.  You ______ tell anyone — it's a surprise! (proibição)

7.  You mustn't to wear a tie.

8.  I don't must work at weekends.

9.  You don't have to park here — it's a no-parking zone.

1.  don't have to

2.  mustn't

3.  have to

4.  don't have to

5.  must / have to

6.  mustn't

7.  You mustn't wear a tie.

8.  I don't have to work at weekends.

9.  You mustn't park here.