Can / Can't - Must/Mustn't

Help

(Prohibition, obligation or lack of obligation?) The British have to drive on the right when they are in France.

Obligation

(Prohibition, obligation or lack of obligation?) The British don't have to wait until they are 18 to get a job after school.

Lack of obligation

(Prohibition, obligation or lack of obligation?) Josh must be at school on time.

Obligation

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