一般過去時(shí)與現(xiàn)在完成時(shí)之間的轉(zhuǎn)換：
1.The film began five minutes ago.(改成現(xiàn)在完成時(shí))
The film___ ___ ___ for five minutes.
2.They got to know in 1984.
They ___ ___ each other since 1984.
3.My mother bought the red car three years ago.
My mother___ ___ the red car three years ago.
4.He received a letter from his sister three days ago.
Three days ___ ___ ___ he received the letter from his sister.
5.We haven't seen each other for a long time.
___ ___ a long time ___ we met last.
6.The Greens came to China in 1994.
The Greens ___ ___ ___ China for 13 years.