$\text{1.}$ I wish I had a computer.

$\text{→}$ Câu cầu ước trái với HT: S + wish<es> + S + Ved/ P1/ were.

$\text{2.}$ I wish it weren't raining today.

$\text{3.}$ I wish you could understand how I felt about you.

$\text{4.}$ I wish the weather were better today.

$\text{5.}$ We wish the teacher gave us high marks.

$\text{6.}$ Minh hasn't written to his pen pal for 5 months.

$\text{→}$ S + last + Ved/ P1 = S + have/ has + not + Ved/ P2.

$\text{7.}$ They used to wear jeans when they were young.

$\text{→}$ used to-V: đã từng

$\text{8.}$ I haven't written to my uncle since July.

$\text{9.}$ I haven't seen Nam for 3 years.

$\text{→}$ It's + time since + S last + Ved/ P1 = S + have/ has not + Ved/ P2.

$\text{10.}$ The last time we saw her was when we left university.

$\text{→}$ S + have/ has + not + Ved/ P2 = The last time + S + Ved/ P1 + was + time.

$\text{11.}$ This is the first time we have played a computer game.

$\text{→}$ This is the first time + S + have/ has + Ved/ P2.

$\text{12.}$ Minh has collected stamps since 2000.

$\text{→}$ began/ started + V-ing/ to-V = has/ have + Ved/ P2

$\text{13.}$ They started learning English for 10 years.

$\text{14.}$ The boy who threw that stone will be punished.

$\text{15.}$ The flowers which I bought for my sister were roses.

$\text{→}$ nếu bỏ that thì nghĩa của câu ko đổi nên dùng which

$\text{16.}$ That's the room in where the meeting is held.