STRONG OBLIGATION: They have to do the right thing, We must remember to renew our visa, OBLIGATION: Some organizations think that staff ought to save more money, We really should recycle, NO OBLIGATION / NECESSITY: Employees don't have to take part in the scheme, Passengers don't need to buy a ticket because they can pay on the train, PERMISSION TO DO SOMETHING: The media are allowed to take photos during the press conference, They can opt-out if they choose not to save, You may turn over your exams paper now, PROHIBITION: Staff members aren't allowed to use the telephone to make personal calls, You can't park outside the building without a permit, You mustn't talk during the presentation,

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