jack has been dead for three years

jack has been dead for three years He has been dead for three years He has died for three years.He has been dead for three years She said that her mother ( ) for three years.A.has been dead His grandmother() for three years A.died B.dead C.has been d his grandpa has been dead for three years.改为同义句 she has been dead for three years.解释下been的作用.我知道是现在完成时,但不明白为 为什么是he has been dead for 10 years而不是he has dead for 10 years My grandma has been dead for five years 同义句 Her grandmother has been dead for two years 为什么是 her grandmather has been dead for two years同义句 He 【has been dead】谓语【 for 3 years】状语