Beginners 1 - 3rd class

Explanation of the simple present

https://www.really-learn-english.com/simple-present.html

Exercises on the simple present

https://www.really-learn-english.com/simple-present-exercises.html

https://agendaweb.org/verbs/present_simple-exercises.html

https://www.ego4u.com/en/cram-up/tests/simple-present-1

https://www.englishclub.com/grammar/verb-tenses_present-simple_quiz.htm