Needn't
. must can • mustn't
• should (x2) . could
1 You're obliged to drive below the speed limit.
You must drive below the speed limit.
2 Is it OK if we get a taxi?
3 It's against the law to fly without a passport.
4
It's not necessary for you to run for the train.
5
I advise you to leave early for the flight.
6
It's probable Alihan will go on holiday next
year.
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7
It's a good idea to give your laptop to the
security staff if they ask for it.