Match the modal verb in the sentence with its function.
1 You mustn’t fight with your brother.
2 I must go to the dentist.
3 You should speak to a lawyer.
4 We ought to go to the meeting in 2 hours.
5 He can solve difficult Maths problems easily.
a) there is a necessity in doing something
b) when you give someone a piece of advice
c) when it is obligatory for you to do something
d) when you are able to do something
e) when you give someone a piece of advice