(1)His grandpa died 3years ago.改为同义句

(1)His grandpa died 3years ago.改为同义句
1.His grandpa_has__ _been_ _dead__ _since__ 3years ago
2._It's___ 3 years _since___ his grandpa died
(2)The flower exhibition has been open for 7 days.改为同义句
The flower exhibition has been open __since___ __7____ __days___ __ago___
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三、终止性动词的用法特征
1.终止性动词可用来表示某一动作完成,因此可用于现在完成时.如：
The train has arrived.火车到了.
Have you joined the computer group?你加入电脑小组了吗?
2.终止性动词表示的动作极其短暂,不能持续.因此,不可与表示一段时间的状语连用(只限肯定式).如：
(1)他死了三年了.
误：He has died for three years.
正：He has been dead for three years.
正：He died three years ago.
正：It is three years since he died.
正：Three years has passed since he died.
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