Клементьева, 7-9. Учебник. Раздел 6. Грамматическая практика

1) The doctor told me to brush my teeth after every meal because this would keep my teeth healthy.
2) The doctor told me to go to bed early and to get eight hours of sleep every night and I would feel better in the morning.
3) The doctor told me to let air into my room, because it would do me good.