Question

where we can use the article "a"?
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Answer 1

Answer:

The indefinite article (a, an) is used before a noun that is general or when its identity is not known.

Explanation:

Definite and Indefinite Articles (a, an, the)

                                                         COUNT NOUNS NON-COUNT NOUNS

Rule #1 Specific identity not known      a, an                 (no article)

Rule #2 Specific identity known               the                          the

Rule #3 All things or things in general    (no article)            (no article)