e.g. I borrowed this book
from the school library three weeks
ago.
= I have
kept this library book for three weeks.
此类题目既要要求对一些动作动词(常是瞬间动词)相关的状态动词(常是非延续动词)很熟悉,还要注意时态的变化,通常是一般现在时变为现在完成时。特别注意瞬间动词不能与表示一段的时间状语联用;有些句子在变化时主语要作一定的调整。
Exercises:
38.A. The
young man has been in the army for four years.
B. The young man ___________ the
army four years _________.
C. __________ two years ___________ the young
man ________ the army .