affirmative
https://agendaweb.org/exercises/verbs/present/affirmative-forms-1
https://agendaweb.org/exercises/verbs/present/affirmative-quiz
https://agendaweb.org/exercises/verbs/present-simple.htm
Negative
https://agendaweb.org/exercises/verbs/do-does-exercises/negative-1.htm
http://baladre.info/english/sedaviwebfront/presimpneg.htm
interrogative
https://agendaweb.org/exercises/verbs/present/do-does-1
https://agendaweb.org/exercises/verbs/do-does
https://www.grammar.cl/Games/Short_Answers_Present.htm
Exercises
https://agendaweb.org/exercises/verbs/present/affirmative-negative-questions-1
https://www.englishclub.com/grammar/verb-tenses_present-simple_quiz.htm
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