Must - We use this word for rules, Have to - We use this word when we talk about facts or external obligation, Mustn't - We use this word to talk about prohibition or breaking rules, Need to  - We use this word when something is necessary, Make or Supposed to  - We use this word for obligations in the present  from other people, Needn't - Doesn't have to -  Don't need - We use the word when something isn't necessary  or there is no obligation,

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