Permission: You can park your car here., May I use my phone, Sir?, Obligation: I must remember to do the cleaning., Students are supposed to show their ID cards., Students have to wear their uniforms., Advice or regret: You'd better finish your snack. Warning., We should've left home early., You ought to/should study hard., Lack of permission: Youngsters under 18 aren't allowed to get in., It is not permitted to feed the animals., They couldn't drink water inside the art gallery., I wasn't able to pay by credit card., Prohibition: You mustn't take photos here., You shouldn't use the new laptop., We aren't meant to reveal the password., Necessity: You need to read your contract., Lack of necessity: I didn't need/have to water the plants., Lack of obligation: You don't/doesn't have to/need to/needn't bring anything to drink.,

Modal verbs.

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