I have been collecting sells since 2008.（改为否定句）

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Ihavebeencollectingsellssince2008.（改为否定句）Ihavebeencollectingsellssince2008.（改为否定句）Ihavebeencollectin

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.