Hello everyone!!

Let´s take into account this information 

7th Grade

Using A & AN

https://www.youtube.com/watch?v=-zZau_dttRY short explanation. 

https://agendaweb.org/grammar/articles-beginners-exercises.html  Agenda, lot of exercises.

https://www.myenglishpages.com/english/grammar-exercise-articles-2.php Select the best option.

https://www.gallaudet.edu/tutorial-and-instructional-programs/english-center/grammar-and-vocabulary/when-to-use-a-an-or-the/