Předpřítomný nebo minuý čas ?
www.english-grammar-lessons.com/presentperfectorpastsimple/exercise1.swf
Doplň správný tvar
web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/upperf2.htm
www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise4.swf
www.adelescorner.org/grammar/pres_perfect/pres_per_vs_past_simple.html
www.adelescorner.org/grammar/pres_perfect/pres_per_vs_past_simple.html
www.montsemorales.com/gramatica/PresPerfPastSim.htm
www.montsemorales.com/gramatica/PresPerfPastSim2.htm
www.englishexercises.org/makeagame/viewgame.asp?id=2959
www.esl-lounge.com/student/grammar/2g12-past-simple-present-perfect-gap-fill-2.php
www.perfect-english-grammar.com/past-simple-present-perfect-1.html
www.perfect-english-grammar.com/past-simple-present-perfect-2.html