it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用?

it's been has been 麻烦告诉一下 been 的语法,一般用在哪里?怎么用? it's been.的全称是不是 it has been... It's+been++a+long+time.been在这里起什么作用?为什么要用been It's has been accepted 英语Has been to 和Has been in 怎么用? it's always been you(It has always been it has been可以缩写成it's been It is/has been+since sb+did 怎么用? had been,has been,has,had 后面加过去分词都是怎么用的? 初中英语语法has been和had been的区别 it has been a It has always been .