I have been collecting shells for three years.和 I have colle

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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

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.

I have been collecting shells for three years.和 I have colle I have been collecting shells for three tear and a half同义句转换 I have been collecting _____(snowy) globes for seven years. I have been collecting shell for5years可以改成 I have been colle They have been collecting shells for there years.（改为同义句） Have you been collecting shells for five years?做否定句 i have been living in shanghai for three years i have been to shanghai for three years.I have been in shang How long have you been collecting shells?, I have been collecting stamps _______i was nine years old I have been here for three years.=It is three years ______I_ 单词拼写小题1:I’ve been collecting shells s_____ I was seven years