I have been collecting shells for three years.和 I have collected shells for three years.在语法和意

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I have been collecting shells for three years.和 I have collected shells for three years.在语法和意
I have been collecting shells for three years.和 I have collected shells for three years.在语法和意

I have been collecting shells for three years.和 I have collected shells for three years.在语法和意
第一句是现在完成进行时态,其情景应该是说话人在说自己已经收集贝壳都三年了,而且同时强调至今仍然还在继续收集贝壳,一直没有停止过.
第二句现在完成时,只是表示已经收集了三年的贝壳,至于现在还是否仍然在收集贝壳并没有说,可能很多年前就停止收集了.这句话强调的只是动作曾经发生过.

前者为现在完成进行时，后则为现在完成时，前者更强调现在还在收集。

一楼的回答非常完美，建议采纳。。。现在BD够好玩了，有提问都自动发消息

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.