The old man died 4 years ago. （非延续性）The old man has been dead for 4 years. （延续性）It is 4 years since the old man died. （延续性）Four years has passed since the old man died. （延续性）
延续性动词和非延续性动词造句
i have owned this book for a long time
i bought this book last week2014-06-09
The old man died 4 years ago. （非延续性）The old man has been dead for 4 years. （延续性）It is 4 years since the old man died. （延续性）Four years has passed since the old man died. （延续性）2014-06-09
