Выразите идея в прошедшем и будущем времени,изменяя событие медли при

необходимо использовать модальные глаголы

В прошедшем 
1. I could do it then.
2. He said that I was allowed to use his phone.
3. He had to go there then.
4. You should have been more attentive.
5. He did not have to write the letter.
в будущем
1. I will be able do it later.
2. He will say that I will be allowed to use his phone.
3. He will have to go there later.
4. You will have to be more attentive in the future.
5. He won't have to write the letter.