Notes On Indefinite Article - Usage - CBSE Class 9 English Grammar
Indefinite Article:    “A or An” is called the indefinite article, because it usually leaves        indefinite person or thing spoken of. For Example:     A Doctor. That is any “Doctor”. The indefinite article is used before singular countable nouns, e.g.           A book, an orange, a girl.                            Use of “A or An” or Indefinite Article The choice between a and an is determined by sound. An: Before a word beginning with a vowel sound “an “ is used; as,  An enemy, an inkpad, an orange, an umbrella, an hour, an honest man, an heir. In above examples the words hour, honest, heir begin with a vowel sound, as the initial consonants h is not pronounced. The article “an”is used by using this formula   Common noun + countable + singular + vowel sound A:  Before a word beginning with a consonants sound “ a “ is used; as,   A boy, a women, a yard, a horse, a hole, Also a university, a union, a European, a ewe, a unicorn, a useful article. At above the words university, union, unicorn, useful begin with a consonant sound, that of yu. Similarly we say , A one-rupee note, such a one, a one-eyed man. Because one begins with the consonant sound of w. The article “a” is used by using this formula   Common noun + countable + singular  The Indefinite Article is used- 1. In its original numerical sense of one; as,   Twelve inches make a foot.    Not a word was said. 2. In the vague sense of a certain; as,    One evening a beggar came to my door. 3. In the sense of any, to single out an individual as the representative of a class; as,     A pupil should obey his teacher.     A cow is a useful animal

#### Summary

Indefinite Article:    “A or An” is called the indefinite article, because it usually leaves        indefinite person or thing spoken of. For Example:     A Doctor. That is any “Doctor”. The indefinite article is used before singular countable nouns, e.g.           A book, an orange, a girl.                            Use of “A or An” or Indefinite Article The choice between a and an is determined by sound. An: Before a word beginning with a vowel sound “an “ is used; as,  An enemy, an inkpad, an orange, an umbrella, an hour, an honest man, an heir. In above examples the words hour, honest, heir begin with a vowel sound, as the initial consonants h is not pronounced. The article “an”is used by using this formula   Common noun + countable + singular + vowel sound A:  Before a word beginning with a consonants sound “ a “ is used; as,   A boy, a women, a yard, a horse, a hole, Also a university, a union, a European, a ewe, a unicorn, a useful article. At above the words university, union, unicorn, useful begin with a consonant sound, that of yu. Similarly we say , A one-rupee note, such a one, a one-eyed man. Because one begins with the consonant sound of w. The article “a” is used by using this formula   Common noun + countable + singular  The Indefinite Article is used- 1. In its original numerical sense of one; as,   Twelve inches make a foot.    Not a word was said. 2. In the vague sense of a certain; as,    One evening a beggar came to my door. 3. In the sense of any, to single out an individual as the representative of a class; as,     A pupil should obey his teacher.     A cow is a useful animal
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