http://www.englisch-hilfen.de/en/exercises/questions/simple_present2.htm
http://www.englisch-hilfen.de/en/exercises/pronouns/personal_pronouns.htm
http://www.agendaweb.org/grammar/personal-pronouns-exercises.html
http://www.learnenglishfeelgood.com/english-personal-pronouns1.html
http://www.myenglishpages.com/site_php_files/grammar-exercise-personal-pronouns.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=2188
http://www.agendaweb.org/vocabulary/weather-exercises.html
http://interactivesites.weebly.com/seasons--weather.html
http://www.myenglishpages.com/site_php_files/vocabulary-exercise-seasons.php
https://www.curso-ingles.com/aprender/cursos/nivel-basico/verb-tenses-present/present-simple
https://www.englisch-hilfen.de/en/exercises/tenses/simple_present_s.htm
https://www.englisch-hilfen.de/en/exercises/tenses/simple_present_s4.htm
https://agendaweb.org/verbs/present_simple-exercises.html
https://www.myenglishpages.com/site_php_files/grammar-exercise-simple-present.php
https://agendaweb.org/verbs/present-simple-negative.html
https://www.englishclub.com/grammar/verb-tenses_present-simple_quiz.htm
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