May / might

- Telephone conversation...

Ana: Hello Ben!
Ben:Hello Ana!
Ana: I phone to say you that tomorrow there is a party. It will be at Mary's house.
Ben: Oh! I'm sorry but I'm sick, I have a fever...I am not sure if I will be better tomorrow. But I think I may go.
Ana: Ok!, I like that you think positive. Bye!
Ben: Bye! thank you for calling.

- In a forced landing:

"The airplane may not land on the sea because there are some boats!"


- We are out of school and we go to my car, but my keys aren't in my bag...

Susanna: Perhaps your keys are in your house...
I: My keys mightn't be in my house because I have driven my car until here, so they must be here!

To be able to

- When I was in my ICT, I was able to connect to messenger

Can / could

- If I pass my exams, I can go on school trip.

- If I were rich, I could buy a house near the sea, a luxury car, or bribe the teachers to pass me, etc.

Should/ ought to

- We're going to Las Dalias market, you ought to take some money because you could see things that you like
- I'm lost in the village, I don't know where I am, I should ask somebody :s

Had better

- We're on the bus, we are going to london. In London it's cold, so you had better wear a coat

Have to

- Let's go to do the english work at library. You don't have to take your laptop to the library, we have some computers there.
But it's true that you have to be quiet at library

Need to

- I didn't understand what you told me, so we need to talk now

- We have a lot of time to talk because today we'll be together two hours between class and class, so we needn't hurry...