Modals obligation/advice

You--- buy a plane ticket in advance

• ought to

• must

• have to

You --------park here.

• mustn't /Can't

• don't have to

You-----(pay) for the bus to the shopping centre.

• don't have to

• mustn't /can't

You----- leave your car unlocked.It might get stolen

• can't

• Mustn't /Shouldn't

• have to

You------- use that door-it's for emergency only

• shouldn't

• mustn't/ Can't

• don't have to

you------ only use by the official taxis.

• have to

• must /should