Obligation, Aria has to study tonight, so she can't see her girlfriend., You don't have to pay for dinner; it's my treat!, Passengers must fasten their seatbelts during takeoff.”, She ought to apologize for missing Maya’s art gallery opening., Permission/Prohibition, You mustn't smoke in here., Could I bring my girlfriend to your birthday party?, Can I borrow your green sweater for my date tomorrow?, We can't use our phones during our dates, remember?, Can you lend me your pen?, Could you open the window, please?, Advice, You shouldn't worry so much about meeting my parents., You should text her back; it’s been two days!, Suggestion, Should we watch a romantic movie together tonight?, We could go to that nice café for breakfast.

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