They've been waiting here since twenty minutes ago.(为什么加been,加been表示什么）

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• 在英语现在完成式中 i have lived here since my childhood.i have been in this school since 2000.在英语现在完成式中 i have lived here since my childhood.i have been in this school since 2000.在这两句中为什么为什么有一句要加been?
• They've been waiting here since twenty minutes ago.(为什么加been,加been表示什么）
• 关于since引导时间状语从句时的用法我们老师说若since引导的状语从句的谓语动词是持续性动词或表示状态的静态动词(如live,stay,study,learn,smoke,be等)的过去时,则从句表示的时间是“从该动作或状态的完成或结束时算起”.如：I’ve written her 20 letters since I have been here.自从我来到这,我已经给她写了20封信.(从开始算起) I’ve written her 20 letters since I was here.自从我离开这儿,我已经给她写了20封信.(从结束算起)但是课文有一句That's changed since I was here.为什么要要理解成“我到这里之后一切就变了”?
• They've been waiting here since twenty minutes ago.(为什么加been,加been表示什么）
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