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Grammar Quizzes
Fairly advanced site with explanation and online exercises.
Count/Non-count Nouns
English for Everyone
A series of worksheets to practice
ESL LIbrary
Worksheet with explanation and exercises
OWL
https://owl.purdue.edu/owl/general_writing/grammar/using_articles.html
Very comprehensive explanation of using articles.
Same site as above, focusing on count/non-count
Using English
https://www.usingenglish.com/quizzes/#Articles
Online quizzes, with an option to print in handout format. Nice supplement.
Commnet count and non-count nouns
https://guidetogrammar.org/grammar/noncount.htm
Great explanations, although a little advanced, with quizzes at the end
ESL Library count/non-count handout
Printable overview with exercises
English for Everyone count and non count noun worksheetsCouConCC
Worksheets for basic count and non-count identification as well as few/little andtoo/very