Expressing possibility:My aunt may travel alone.
Maybe he will make the tour alone.
Perhaps she will visit Ibiza.
Possibly, she will go by plane.
It's possible that someone will meet her railway station.
She might buy some presents for the family before she goes.
I suppose she might spend a lot of money on fashionable clothes.
There's a chance they'll like the city.
I will take an umbrella as it could rain heavily there.
Examples: Jane: Have you seen Sophia? I can’t find her.
Sally: She could be in the library.
Jane: No, she is not. I have just been there.
Sally: Perhaps she is with Mary. They were here this morning.