50 RULES TO MASTER THE USE OF ARTICLES - Simplified| ENGLISH LESSONS | ENGLISH MASTERY CLASSROOM Rules to Master the Use of Articles (A, An, The) 1. Use a before consonant sounds a book, a university (sounds like you) 2. Use an before vowel sounds an apple, an hour (silent h) 3. Use the for specific or known things the teacher, the sun 4. Use a / an when mentioning something for the first time I saw a dog. The dog was barking. 5. Use the with unique things the moon, the earth 6. Use the with sup