Помогите пожалуйста.
Выполните упражнение по согласованию времён.
1. I know only the story he (to tell) me a couple of months ago.
2. The librarian answered that the books (to be) returned next week.
3. My sister said that she (to find) some interesting materials for my presentation and she already (to send) them to me.
4. She said that I (to write) to her more often earlier.