Преобразование утвердительных предложений в отрицательные

1. By 5 o'clock the rain had not stopped.
2. Mum and I were not having tea at 5 o'clock.
3. They had not been staying at the hotel since May.
4. I was not flying to London that morning.
5. He had not known Mark all my life.
6. The waiter did not enter the dark kitchen.
7. Granny did not arrive yesterday evening.
8. Lee was not constantly late for the first class.
9. Sam did not live in the country last summer.
10. Laura had not been writing with my pen for a week.