Can, could, may or might???

I __________ swim across the river.

____________ you lift this box?

May I ____________ in?

It _________ rain in the evening.

She can _________ more than 2 languages.

I ___________ swim across the river when I was young.

She said that she could _________.

___________ dogs fly? No, of course not. They can only walk.

I'm going to bring an umbrella today because it _________ rain.

She ___________ understand Korean well, but she can _________ it perfectly.