More on Present Perfect

Answer Key 

Listening Practice

Listening 14.4 Listening 14.5

Answer Key

Present Perfect Explanation

http://www.ompersonal.com.ar/omverbs/simplepresentperfect.htm

Present Perfect Simple

http://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_statements.htm

Present Perfect Exercises Yet / Just / Already

http://www.ang.pl/cwiczenia/819