1. When the word begins with a consonant you must use 'a'
2. ARTICLES AND/ A
3. If you use words and phrases such as 'ball', 'glass of water' or 'cup of coffee', then it would be "a ball", "a glass of water" and "a cup of coffee". An indefinite article is used when you say someone's profession Example: I am a teacher. Indefinite articles are widely used with exclamatory expressions in English, Example: What a nice day!
4. However, with this rule there is an exception. If you are using a word with a silent 'h', such as 'honorable' or 'honest' then you have to use 'an'. Therefore, it would be "an honorable man" and "an honest mistake".
5. A/AN
6. EXAMPLE: A BOY
7. EXAMPLE; A CAT
8. EXAMPLE: A GIRL
9. An is normally used before a noun that starts with a vowel
10. EXAMPLE: AN APPLE
11. EXAMPLE: AN ELEPHAT
12. EXAMPLE: AN UMBRELLA
13. Before a word that starts with a silent h, it is used: example, AN HOUR.
14. EXAMPLE: I AM A GOOD STUDENT
15. EXAMPLE: SHE IS A YOUNG WOMAN
16. When the word starts with a voice (a, e, i, o, u), you should use 'an'
17. When the 'u' has the same sound as the 'y' in "you", or the 'o' has the same sound as the 'w' in "won" then you must use 'a'. EXAMPLE: a one-legged man” y “a European trip
