Present Perfect Continuous

http://www.englishpage.com/verbpage/presentperfectcontinuous.html

http://www.learn4good.com/languages/evrd_grammar/presentpcont.htm

http://www.ego4u.com/en/cram-up/grammar/present-perfect-progressive

http://www.ego4u.com/en/cram-up/grammar/present-perfect-progressive/exercises

http://www.grammarnet.com/ghtml/present/exprespcon1.htm

http://www.learn4good.com/languages/evrd_grammar/presentpcont_exc.htm

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

http://www.learnenglish.de/Games/Tenses/PrePerCon.htm

http://www.englishtenseswithcartoons.com/page/test/present_perfect_continuous_exercise

http://www.casadoalan.com/Present_perfect_continuous_exer.html

http://www.englishforjapanese.com/exercises/verb%20forms/20%20perfect.html

http://www.perfect-english-grammar.com/present-perfect-continuous-exercise-2.html

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-52071.php