摘要: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相关的状态动词很熟悉.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 .

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