Modal Verbs

Modal verbs	Examples	Uses
Can	He can swim magnificently. Can we go outside?	Ability, Permission, Request
Could	My Mum could play tennis when she was younger. Could I have a glass of water, please?	Past ability, Permission, Request, suggestion
Shall	Shall we go to the park?	Suggestion
Should	You look sick. You should see a doctor.	Advice
May	It may rain in the weekend.	Permission, future possibility
Might	I might meet you tonight.	Doubtful possibility
Will	I’ll help you with your homework.	Instant decision, offer, promise, prediction
Would	Would you like to go to the cinema?	Request, Invitation
Must	You must follow the rules! He is not here, he must be in his office.	Prohibition, deduction,obligation

You mustn't forget certain things, such as: 

- no "s" in the 3rd person singular

- in the interrogative form, we need "Inversion" (May I .....?)

- you do not need an auxiliary verb to write the interrogative or the negative forms

- Modal + verb in the infinitive (to)

Now, I believe you're ready for some challenges:

Challenge A

Challenge B

Challenge C

Challenge D 

Challenge E

Challenge F 

Challenge G