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The article in English
1. The indefinite article ("a") is used when referring to a common noun in a general sense.
- "A cat is a mammal."
- "Hydrogen is a gas."

The article "a" becomes "an" before a word that begins with a vowel sound: a, e, i, o, u.
- "Hydrogen is an element."

The indefinite article is not used before a plural noun.
- "Cats are mammals."
- "Hydrogen and helium are gases."

2. The definite article ("the") is used when referring to a particular object or person. It is used before both singular and plural nouns.
- "The cat in the picture is black."
- "The cats in the picture are black."

Further information is available on the following webpage.
How to Use Articles (a/an/the)

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