http://www.agendaweb.org/exercises/verbs/present-perfect
http://mrbrownslearningspace.com/wp-content/uploads/2015/01/Present_Perfect_1.htm
http://www.agendaweb.org/exercises/verbs/present-perfect-multiple
http://www.agendaweb.org/exercises/verbs/present-perfect-sentences
http://www.agendaweb.org/exercises/verbs/present-perfect-mixed
http://www.nspeak.com/newbasic/grammatica/presperfect.htm
http://www.english-grammar-lessons.com/presentperfect/exercise4.swf
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