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31. He said that he was cutting off the main valve.
32. Nam said that his uncle often planted the vegetables in the afternoon.
33. She said that her uncle would not plant the vegetables the next day afternoon.
34. Nga said that Mr and Mrs Pike had just read those newspapers.
35. She said that she often listened to music at night.
36. Lan's mother said that her daughter usually brushed her teeth before meals.
37. They said that they had to do the assignments now.
38. Lan said that her sister seldom rode a bike to school.
39. They said that their teacher sometimes explained the difficult lesson.
40. Nam said that he was doing his homework now.