35. His friends send him some postcards last week

⇒ He was sent some post cards by his friends last weeks
36. His friends didn't send him some postcards last week

⇒ He wasn't sent some postcard by his friends last week
37. They have built this house since January

⇒ This house has been built since January
38. They hold the Olympic Games every four years

⇒ The Olympic games was hold every four years

39. Ms Huong teaches us Math at school

⇒ We are taught Math at school by Ms Huong

40. My mother doesn't often take me to school

⇒ I am not often taken to school by my mother

41. his brother bought him some books in this store two days ago

⇒ He was bought some books in this store by his brother two days ago
42. We have eaten this food before

⇒ This food has been eaten before
43. I haven't seen her for a long time

⇒ She has not been seen for a long time
44. He had written her letters since last week

⇒ Her letters have bên written since last week
45. My sister cooked the dinner an hour ago

⇒ The dinner was cooked by my sister an hour ago

🍀 @ᵯᶨทȶ 🍀

35.Some postcards were sent to him by his friend last week.

36._________________weren't____________________________________.

37.This house has been built (by them) since January.

38.The Olympic games is held (by them) every four years.

39.We are taught Math at school by Ms.Huong.

40.I am not taken to school by my mother.

41.Some books were bought for him in this store by his brother two days ago.

42.This food has been eaten (by us) before.

43.She hasn't been seen (by me) for a long time.

44.Her letters have been written by him since last week.

45.The dinner was cooked by my sister an hour ago.