Modals Verbs, Types and Example Sentences

Could	Possibility	Extreme rain could cause the river to flood the village.
	Permission	Could I use your notebook please?
	Request	Could you tell me the way to the library please?
May	Possibility	That may be a better solution for you.
May	Permission	“You may buy something, if you wish,” said her grandfather..
Might	Slight possibility	This team might win the game, but I doubt it.
Might	Past form of may (reported speech)	The doctor said he might be late.

Can	Ability	Mary can play piano.
	Permission	You can look at this.
	Offers	Can I help you father?
Should	Advice	I think you should buy the blue one.
Should	Logical deduction	I’ve revised so I should be ready for math exam.
Will	Future tense auxiliary	Next week I will be in London.
Will	Invitations	Will they join us for play football?