Перепишите каждое из следующих предложений дважды: в прошедшем и в будущем времени. Заменяйте модальные глаголы must и can эквивалентами, где необходимо
1. He can't join the party because he is busy.
2. I can settle my own problems.

He couldn't join the party because he was busy.He won't be able to join the party because he will be busy.I could settle my own problems.I will be able to settle my own problems.