Articles: a / an We use a / an with singular countable nouns: 1. when we say what something is or what somebody does I saw an old man with a dog. 2. the first time we mention a thing / person Its a nice house. Shes a lawyer. 3. in exclamations with What ... ! What an awful day! 4. in expressions of frequency. I have classes three times a week. #article 84 views16:01
