Exercises third person

https://www.englisch-hilfen.de/en/exercises/tenses/simple_present_s.htm

https://www.grammarbank.com/simple-present-3rd-person.html

https://www.ego4u.com/en/cram-up/grammar/simple-present/exceptions/exercises

https://english.lingolia.com/en/grammar/tenses/simple-present/exercises

http://www.englishexercises.org/makeagame/viewgame.asp?id=1731