原句I have been away from Shanghai for 3 days为什么不能改成 I have been leave from Shanghai for 3 days?还有have been有什么用

I have never been away! 原句I have been away from Shanghai for 3 days为什么不能改成 I have been leave from Shanghai for 3 days?还有have been有什么用 I have never been away!什么意思? have been away I have been up to this (I do the cooking evreyday.)I have been up to this point.括号里面不是原句,只是一个语境 His father has been away from Beijing for a week.（保持原句意思） stay这首歌是谁唱的?（提示前2句歌词是I've must have been blind Not to see you look away from me ） have been away 和 has/have left they have been there before.so have i they have been there before.(),() 改为同义句 They have already been away from the dangerous place同义句They__been away from the dangerous place__. where have you been I have been to Australian 这个句where have you beenI have been to Australian I have been playing piano for ten years.同义句I have been playing piano____ten years____ i have been a teacher for twenty years（保持原句意思） i ___ ___ ___ a teacher for twenty years. since,they,been,from,ago,two,here,away,have连词成句 I have been away for a long time等于I____a long time_____. I have been away from home for 12 years.（改为过去时间状语 I have been away from something please leave a message什么意思 As you know,I have been passing away of love请问这句话的意思