I have been collecting shell for5years可以改成 I have been collecting shell since 5yearsago吗?为什么?

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Ihavebeencollectingshellfor5years可以改成Ihavebeencollectingshellsince5yearsago吗?为什么?Ihavebeencollecting

I have been collecting shell for5years可以改成 I have been collecting shell since 5yearsago吗?为什么?
I have been collecting shell for5years可以改成 I have been collecting shell since 5yearsago吗?
为什么?

I have been collecting shell for5years可以改成 I have been collecting shell since 5yearsago吗?为什么?
可以.
for是时间长度.
since是时间点.