VI,
32. These books were bought for my sister
33. Foreign languages are learnt by us on the computer
34. The birthday cake is being cut by Nancy
35. The architect , who designed these flats , has moved to HCM city
36. These are the photos which we took when we were in Da Lat
VII,
37. haven't finished
38. was having/ was surfing
39. have .. been
40. chatting