Category : 3rd Class
A and An are indefinite articles because they do not refer to any particular person, animal, thing or place.
Use of A
Rule 1: A is used before a singular countable noun beginning with consonant or sounds like consonant.
In the above given sentences 1 and 2 a has been used before pen and teacher (nouns) which begin with a consonant sound.
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Rule 2 :
A is used before singular noun beginning with a vowel letter but sounds like a constant.
In these examples, a is used before European, university, useful and one. All of these nouns are beginning with vowels but they are sounding like consonant.
Use of 'An' Rulel:
An is used before a singular noun beginning with a vowel or sounds like vowel.
In these examples, anis used before engineer and umbrella. Both of these words have begun with vowel.
Rule 2 : An is used before a singular noun beginning with consonant but sounds like vowel.
In these examples an has been used before honest, honourable, M.L.A and M.P. "hough these words begin with consonants but they sound like vowel. Therefore before them an has been used.
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