Article A / AN games

 https://www.quia.com/rr/53245.html

http://www.adelescorner.org/grammar/articles/articles1.html

http://www.adelescorner.org/grammar/articles/articles2.html

https://www.softschools.com/language_arts/grammar/article_a_or_an.jsp

https://www.englishexercises.org/makeagame/viewgame.asp?id=1203