What do the modals in these statements express?

• Объекты 1
  • It's a secret. You mustn't tell anybody about it.
  • Could you skate when you were 6 ?
  • Mary might come to our meeting, but we are not sure.
  • Could you open the door, please?
  • May I use your tablet?
  • You should read this novel. It is really great.
  • I'm so happy. I don't have to go to work tomorrow.
  • It's getting late. I have to go.
• Объекты 2
  • Prohibition
  • Ability
  • Possibility
  • Request
  • Asking for permission
  • Advice
  • Absence of necessity
  • Necessity