have been I have been a doctor before.I had been a doctor before.第一句的表达对吗?have been 表示的应该是从过去到现在一直在从事这个职业,为什么有些人用have been 在后面还要加before?

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I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. I have get a bee in my bonnet?是什么意思 I have been there,have been 是have been in还是have been to的缩写? I have forgotten you have been If you have been I have loved have been怎么用,i have i have always been there i have never been there I HAVE NEVER BEEN,能否说I never have been I have been so serious I have been so serious I-have-been-at-home I have always been you I have been loving you