lisa's mother has been ill for two years.这个句子中为什么有been?

lisa's mother has been ill for two years.这个句子中为什么有been? Lisa has been playing the violin for two years 改为否定句 His father has been dead for two years为什么用been?been不是表被动吗? Her grandmother has been dead for two years 为什么是 Her mother is ill.She has been( )for two weeks.A.in the bed She has been ill for over two days .(改为同义句） she has been ill Linda has been ill for two days .Let's go and see __ after s He has been now dead for many years这个句子中为什么要加now?now在这里有含义吗? her husband is ill,he has been ()for 7 years. Lucy has been away from home for two years 句型转换 it's two yea The doctor and writer has been here for two years.为什么用has? 改错:He has been to Beijing for over two years