1) You don't have to fill in the form
2) Paul should take a break form working on the computer
3) He must finish that report for me by 5 o'clock
4) Visitors must not use their mobiles in the hospital
5) Can I leave early today?
6) Vicky wasn't able to come to the party because the was ill
7) Shall I get you something to eat?
8) Sarah can't use the lift because she is claustrophobic
9) My optician said I ought to let my eyes rest