Are these ok? Thanks Fulvio 1. Students under 17 mustn't smoke. 2. You must wear a helmet while riding a bicycle. 3. Due to daylight saving you must set your clock 1 hour forward.
Top answer
They are OK, but 'should' would be more usual in all 3 instances, I think.
— Mister Micawber
They are OK, but 'should' would be more usual in all 3 instances, I think.
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