1) We use "Couldn't" when we want to express a) Advice b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  2) We use "Should/ Had better" when we want to express a) Advice b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  3) We use "Can't/ Mustn't" when we want to express a) Advice b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  4) We use "Can/ Be able to" when we want to express a) Advice b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  5) We use "Don't have to " when we want to express a) Advice b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  6) We use "Have to/ Must" when we want to express a) Necessity/Obligation b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation  7) We use "May/can/could" when we want to express a) Necessity/Obligation b) Permission c) Ability-present d) Ability-past e) Prohibition f) No obligation 

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