necessity/ obligation, I must go home. It's late., I have to go home. It's late., I'm supposed to go home around 21:00., I've got to go home., It's necessary for me to go home around 21:00., It's essential for me to go home around 21:00., I need to go home around 21:00., permisssion, I'm allowed to hang out till 21:00., Office workers are allowed to wear casual clothes., You can hang out till 21:00.

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