Modal Auxiliary

Modal	Functions	Examples
Can	Ability	I can do my job perfectly.
Could	Capacity	I could play till night.
May	Permission	May I come in sir?
May not	Prohibition	You may not borrow notes in exam hall.
Might	Possibility	It might rains today.
Should	Advice Probability	You should study regularly. The teacher should be in class.
Must	Obligation/Compulsion	You must win tomorrows match.
Will	Certainty	We will face the fast bowlers.
Would	Polite Request	Would you please give me your note book.
Shall	Determination	The decision of umpire shall be final.
Need	Necessity	I need to work for my family.
Ought to	Moral Obligation	You ought to follow your words
Used to	Past habit which is not continue	I used to visit this place at my childhood.