41. My father has not seen my uncle for nearly 20 years.

→ It's + time + since + S + V2/ed + O ⇔ S + has/have + not + V3/ed + O + for + time 

42. I wish I had a computer

→ Wish ở hiện tại: S + wish(es) + (that) + V2/ed + O

43. A supermarket is going to be built in my neighbourhood

→ Chủ động: S + tobe (is/am/are) + going to + V + O + ... ⇔ O + tobe (is/am/are) + going to + be + V3/ed + by S

44. Liz hasn't sent us a letter since she returned to the USA.

→ S + has/have + V3/ed + O + since + S + V2/ed + O (HTHT - QKĐ)

45. A new school was built in our village last year.

→ "School" là sự vật ko thể hoạt động và có "last year" → dùng bị động QKĐ

→ S + was/were + V3/ed (+ by sb)