Choose the right verbs to complete the sentences.

Choose the correct option.

Alex [could|can|is able to] speak four languages now.

[Am I able to|Was I able to|Could I] borrow your phone? My battery ran out.

Despite the difficulties, Mia [has been able to|could|can] solve our problem.

You [couldn't|wasn't able to|can't] go for a walk because you're grounded.