a good friend must / doesn't have to / should , a good teacher has to / can't, a good sibling doesn't have to / has to  , a good waiter should / shouldn't / mustn't, a good shop assistant must / shouldn't , if you want to learn English, you should , a good politician has to / doesn't have to / should / mustn't, a good wife/husband must / should / mustn't , a good doctor doesn't have to / mustn't , a good person has to / should / doesn't have to .

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