a good friend must / doesnt have to / should, a good teacher is supposed to / has to / mustn't, a good sibling doesnt have to / is supposed to / has to, a good waiter should / shouldn't / mustn't, a good shop assistant must / is supposed to / shouldn't, a good politician has to / doesn't have to / should, a good wife/husband must / should / mustn't, a good doctor is supposed to / doesn't have to / mustn't, a good person has to / should / doesnt have to

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