1. Jeremy said that he usually played chess with his brother
2. Monika said that her brother was flying to Moscow then/at the moment
3. Susan said that she had bought that dress a year before/previously
4. Sharon said that they would celebrate his birthday on Saturday
5. Brian said that he had been playing football for ten years at the moment/then
в предложениях где есть / можно выбрать любой удобный вариант, значение не меняется