37. Was visiting - was going

38. were having

39. were talking - came

40. called - was buying

41. was paying - heard

42. Was your student playing soccer at that time ?

43. were playing - were playing

44. was taking - looked

45. was walking - felt - didn't know

46. dropped - was doing - wasn't be broken ( bị động )

47. met - was studying

48. waited

49. arrived - was talking

50. was walking - attacked

51. was living

52. was staying 

53. were sleeping - knocked

54. were playing 

55. didn't meet - was walking

56. what were you writing when your computer crashed ?

57, 58 mình không biết chia quá khứ với quá khứ tiếp diễn bạn nhé. Câu đó mình chia hiện tại