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Need, needn't, don't need, don't have to - Coggle Diagram

- - - - usually in a negative sentence
        
        You needn't speak so loudly
      - it can be used in a question,
        however, in such a case we prefer it as an ordinary verb or have to
        
        Need you go so soon? (rather uncommon and formal)
        
        Do you need to go so soon?
        
        Do you have to go so soon?
      - often in fiction
        
        We need have no fear fo Cicole, she can tke care of herself.
      - in formal written English with negative words
        (hardly, never, nobody, no one, only)
        
        The changes need only be small to make the proposal acceptable.
        
        Nobody ever need know about the money.
        
        - I don't want my parents to know. - They need never find out.
    - - I needed to leave early.
        
        She's thirsty. She needs a drink
- - - - when it's the speaker who decides the lack of neccesity
        
        As you worked late yesterday, you needn't come in until ten tomorrow morning.
    - - when it's sb else who decides the lack of neccesity
        
        We've been told that we don't have to be at work until ten tomorrow.