II. Underline and correct the mistake in each of these sentences (no more than two words).
11. Philip was washing the car while the fire started.
12. Neil was studying when his sister was listening to music.
13. Harriet was opening the door and walked into the house.
14. We were having lunch at a lovely restaurant every day when we were on holiday.
15. Brian drank tea at five o'clock yesterday afternoon.
16. Dad was repairing the TV while Mum cooked dinner.
17. I was going to the cinema last Saturday.
18. I was buying a new dress for my party yesterday.
19. While Jeff built the garden shed, he hurt himself.
20. While the teacher were speaking, the students were listening to him.