Modals of deduction

Modals of deduction

1. How sure we are about something.

2. When we sure...

   • use MUST

3. express

   • ability,permission,necessity

4. we think something is possible

   • -could(less informal),-may(formal),-must(formal)

5. polite request

   • Could you pass me the sugar?
   • you can use may or could

6. PRESENT /negative ability

   • I can swim but i can't sing a song

7. express weak probability or possibility.

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