作业帮I have been collecting sells since 2008.（改为否定句）
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I have been collecting sells since 2008.（改为否定句）
I have been collecting sells since 2008.（改为否定句）
I have been collecting sells since 2008.（改为否定句）
你确定是sells 吗 不应该是shells吗……这否定句改起来怪怪的……I haven't collected shells since 2008.
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 been there,have been 是have been in还是have been to的缩写?
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
I have been a person .
I have never been away!
I have been wet through
because i have been died.