Must, shall, will, should, would, can, could, may and might are all examples of modal verbs. Modal verbs are easy to spot because there are so few of them, they don’t change their spelling and ...

Modal verbs ‘can’ and ‘could’ are used to show ability. For example, “He can carry a sack of maize without breaking a sweat”. Can, could and may are used in making requests.

Modal verb ‘may’ refers to the possibility of something ... In order to give advice, we use the verb ‘should’, for example, “you should give up smoking; it is not good for your lungs”.