http://www.englishpage.com/verbpage/presentperfect.html
http://www.englishpage.com/verbpage/presentperfectcontinuous.html
These
pages explain everything you need to know about present perfect and
present perfect progressive IN GREAT DETAIL. You will notice, however,
that their "use 1" is my "case 2" and their "use 2" is my "case 1" for
the present perfect.
Go to the exercises at the bottom of the page. They're excellent.
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