http://www.englishpage.com/verbpage/presentperfectcontinuous.html
This page explains everything you need to know about present perfect progressive.
At the bottom of the page, there are interactive verb tense exercises for all of the verb tenses that WE HAVE BEEN STUDYING SO FAR. These are wonderful for those of you who enjoy learning on the computer.
http://www.english-zone.com/verbs/prsperfcont.html
Go to the exercises at the bottom of the page. They're good.
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