We use indefinite article to talk about something in particular. In this case, we use the.
Ex: The car in the parking lot is red
We use definite article, when we are talking about something in general. In this case, we use a or an.
If the following word starts with a consonant sound, then we say a:
Ex: a cat, a door, a game
If the following word starts with a vowel sound, then we an:
Ex: an elefant, an ice-cream, an umbrella
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