过去曾学过：He has died for a week. 是错的，由于死是一次性动作，不可能die for a week. 那样，假如说：He has been dyingfor a week. 是不是正确？
He has died for aweek. （误）
He has been dyingfor a week. （误）
He has been deadfor a week.（正）
He died a weekago. （正）
It is a week sincehe died.（正）
注：假如表示“他已经过世一周了”，第二句是错的。不考虑这层意思，单说 He has been dying for a week. 则表示“他濒于死亡已有一星期了”（一周以来处在垂死中）。
