Thanks so much for the comment and using my post in your class. It's so true that most of the exercises out there are too simple and do not touch this aspect of a/an.
I am working on a better produced exercise for Friday 8th Nov, and an exercise on the use of A/An/The/[-] for Monday 11th. Do come back!
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Alan Egan
Starting a new project. English hands on! All comments will be verified before publishing.