4.127 possibility: 'could', 'might', 'may'

You use 'could', 'might', or 'may' to say that there is a possibility of something happening or being the case. 'May' is slightly more formal than 'could' or 'might'; otherwise there is very little difference in meaning between these modals.

• Don't eat it. It could be a toadstool.
• His route from the bus stop might be the same as yours.
• In rare cases the jaw may be broken during extraction.