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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