Complete the second sentence so that it has the similar meaning first one.

52. I last wrote to my uncle in July.

I haven't written to my ucnle since July.

53. I won't be able to do anything unless I have a quiet room.

If I don't have a quiet room, I won't be able to do anything.

54. It started raining an hour ago.

It has rained for an hour.

55. The last time she visited me was five years ago.

She hasn't visited me for five years.

56. Hurry up or we'll be late for the concert.

If we don't hurry up, we'll be late for the concert.

57. When did you start learning English?

How long have you start learnt English?

58. Be careful or you may fall.

If you aren't careful, you'll fall.

59. We started living here fifteen years ago.

We have lived here for fifteen years.

60. It's long time since we became close friend.

We have not become close friend for long time. 

61. We haven't visited my grandfather for two months.

The last time we visited my grandfather two months ago.

62. Our sources of energy will soon end if we don't try to save them.

Unless we try to save them, our sources of energy will soon end.

63. Minh began to collect stamps in 2000.

Minh has collected stamps since 2000.

64. It's the first time that I have ever talked to a foreigner.

I have not ever talked to a foreigner before.

65. There are three interesting films on VTV3 today.

Today VTV3 has three interesting films today.

66. My brother hasn't seen his best friend for nearly five years.

It's nearly five years since my brother last saw his best friend.

67. You will catch a cold if you don't keep your feet dry.

Unless you keep your feet dry, you will catch a cold.

68. Our sources of energy will soon end if we don't try to save them.

Unless we try to save them, our sources of energy will soon end.

69. We make the air dirty because we use the car all the time.

If we use the car all the time, we make the air dirty.

70. We must leave now, or we will miss the plane.

If we don't leave now, we will miss the plane.

71.I have studied English for three years.

I began to study English three years ago.

72. If I don't leave now, I'll miss my train.

Unless I leave now, I'll miss my train.

73. Remember to do your homework.

You must do your homework.

74. I won't be able to do everything myself unless I have a modern robot.

If I don't have a modern robot, I won't be able to do everything myself.

75. I saw Ann yesterday but I haven't seen her today.

I haven't seen her since yesterday.

CHÚC BẠN HỌC TỐT!!!!!!!!!

BẠN NHỚ CHO MÌNH CÂU TRẢ LỜI HAY NHẤT NHÉ!!!!!!

52.written to my uncle since July.

53.a quiet room, I won't be able to do anything.

54.rained for an hour.

55.visited me for five years.

56.we don't hurry up, we'll be late for the concert.

57.have you learnt English?

58.don't becareful,you may fall.

59.lived here for fifteen years.

60.been close friend for long time.

61.we visited my grandfather was two months ago.

62.we try so save them, our sources of energy will soon.

63.collected stamp since 2000.

64.never talked to a foreigner before.

65.three interesting films today.

66.nearly five years my brother hasn't seen his best friend.

67.you keep your feet dry, you will catch a cold.

68.we try so save them, our sources of energy will soon.

69.use the car all the time, we will make the air dirty.

70.leave now, we will miss the plane.

71.studying English three years ago.

72.now, I'll mis the train.

73.do your homework.

74.a modern robot, I won't be able to do everything myself.

75.haven't seen Ann since yesterday.