Indefinite articles ‘a’ and ‘an’-Usage

Choose the appropriate indefinite article.

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Basic rules:

Indefinite articles are ‘a’ and ‘an’. They are called so because they do not specify or define a specific or particular thing.

• Use ‘a’ before a singular countable noun beginning with a consonant sound.
• A countable noun can be counted using numbers, as, one car, two cars, three cars, etc.
• Use ‘an’ before a singular noun beginning with a vowel sound.
• Use ‘an’ before a silent ‘h’ (The noun must be singular and countable.)
• Use ‘a’ before abbreviations that begin with a consonant sound, as,

             a BA degree

             a PA

• Use ‘an’ before abbreviations that begin with vowel sound, as, 

             an MLA

             an MA degree

Watch this video to know more about the rules:

https://www.youtube.com/watch?v=-zZau_dttRY