- Can: Present ability permission
- Must: Obligation
- Mustn´t: Prohibition
- Could: Past ability request
- Have to; Has to; Had to: Obligation/ Neccessity
- Don´t have to; Doesn´t have to; Didn´t have to: No obligation
- May: Possibility
- Might: Remote probability
- Should; Shouldn´t: Advice
- Ougth to: Advice
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