How to use proper articles?

Proper use of articles involves knowing when to apply "a," "an," and "the." Use "a" before consonant sounds (e.g., "a book") and "an" before vowel sounds (e.g., "an Apple"). "The" is used for specific nouns that are already known to the listener or reader (e.g., "the book on the table"). Remember that some nouns may not require an article at all, especially when speaking in general terms (e.g., "Water is essential for life").