ALREADY, YET AND JUST

http://www.esl-lounge.com/student/grammar/2g7-just-yet-already.php

http://www.servator.cat/eva/index_files/Grammar/2ndcycle/4tESO/prsperf2.htm

https://www.vitutor.com/gramatica_inglesa/verb_tense/present_perfect_ej11.html

http://www.englishexercises.org/makeagame/viewgame.asp?id=3211