must - You ( ) get a passport before you go to another country.(formal speaking or writing), can't - Officers look in your bags because you ( ) bring dangerous things on a plane., don't have to - You ( ) bring food on that flight. Dinner is served on the plane,, have to - At the airport, you ( ) get a boarding pass before you get on your plane.(informal speaking), has to - Rob ( ) get a new passport.,

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