Can: I can ride a bike
Could(past): He could speak french when he was three
Can: Can I use your phone?
Could(polite): Could I have a biscuit?
May(polite, formal): May I borrow this book?
Will(polite): Will you pass the milk, please?
Would(polite): Would you help me with my english?
Can: You can borrow my key
May(formal): You may use the computer
Can't: Sally can't be away
Couldn't: He couldn't do the homework
Could: She could either be at the beach or at home
May(future): We may go to the restaurant tomorrow
Might(future): It might rain tonight
- Suggestion and recommendation:
Could(suggestion): You could try speaking to your teacher
Should/ought (suggestion): Should I take this books?
Must(recommendation): He must go to the restaurant
Shall(suggestion): Shall I close the door
Will(certainty): He will arrive tomorrow
Will: I will do the shopping
- Repeated past action:
Would: When he was young, he would spend hours reading
Should/ought to: I should practise the piano now
Must(strong): You must drive with the seatbelt
Should/ought to(logical): She ought to get the job
Must(strong): You must go to bed early
Mustn't: You musn't smoke here
- Lack of necessity:
Needn't: You needn't come to work early tomorrow