Affirmative
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pres1.htm
http://www.english-room.com/presentsimple_01.htm
http://www.bastrimbos.com/Hotpotatoesfiles/spresbev1.htm
http://www2.arnes.si/~oskplucija4/ces/PS.htm
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/pres2.htm
https://www.tuttoinglese.it/present-simple-esercizi.html
Negative
http://www.agendaweb.org/exercises/verbs/present-negative
http://www.grammar.cl/Games/Dont_Doesnt.htm
http://baladre.info/english/sedaviwebfront/presimpneg.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/presnq1.htm
http://www.english-4u.de/pres_neg_ex3.htm
Interrogative
http://www.agendaweb.org/exercises/verbs/do-does
http://www.english-room.com/dodoes_5.htm
http://www.grammar.cl/Games/Short_Answers_Present.htm
http://www.englisch-hilfen.de/en/exercises/questions/simple_present.htm
http://www.english-grammar-lessons.com/presentsimple/exercise4.swf
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/presnq2.htm
Wh- questions
http://www.carmenlu.com/first/grammar/present1_1whq.htm
http://www.perfect-english-grammar.com/present-simple-exercise-6.html
Mixed
http://www.tuttoinglese.it/present-simple-esercizi.html
To be
https://agendaweb.org/
https://www.tuttoinglese.it/to-be-present-simple.html
To have
https://www.tuttoinglese.it/to-have-present.html
THERE IS – THERE ARE
https://www.englisch-hilfen.de/en/exercises/various/there_is_there_are2.htm
https://agendaweb.org/grammar/there_is_are-exercises.html
CAN – CAN’T
https://www.englisch-hilfen.de/en/exercises/modals/can2.htm
https://agendaweb.org/verbs/can-exercises.html
GAME
https://www.eslgamesplus.com/present-simple-tense-action-verbs-interactive-monkey-game/