define article a and an

☆ A 《Article》 ☆ __________________________________ 'A' is used before the word which has a consonant sound in its starting. Example : He was _a_ doctor. __________________________________ ☆ An 《Article》 ☆ __________________________________ 'An' is used before the word which has a vowel sound in its starting. Example : He was _an_ engineer. __________________________________