I'm away this week, so I (might not be able to/ won't be able to) come to your party tonight.
won't be able to
He had some health problems, but (weren't able to/ managed to) recover.
managed to
Byron Vincent grew up on a rough housing estate where children (weren't able to/ were able to) get a good education.
weren't able to
People across Britain (will be able to/ are managed to) see him later this year on national tour.
will be able to
The homework was really difficult, but I (could/ managed to) finish it.
managed to
Byron always had a great love for language, but he (couldn't/ managed to) develop his natural talent.
couldn't
He (is able to/ managed to) make people laugh at his experiences.
is able to
People say that Albert Einstein (couldn't/ can't) read until he was nine.
couldn't
Jake finally (could/ managed to) pass his entrance exam for university.
managed to
My sister (managed to/ could) read by herself from the age of four.
could