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Rules to use the indefinite articles (When the singular form is used to…
Rules to use the indefinite articles
When the singular form is used to make a general statament about all people or things of that type
Before singular countable noun that mean ONE
Before a consonant or consonant sound
When indefinite nouns are mentioned (they are actual things, not symbols, but they are not specifically identified)
With expressions of price, speed, and ration, or with certain numerical expressions
With name of professions
Before singular count nouns when the noun is mentioned for the first time
"A" is not used before a noncount noun
With the expression A NUMBER OF means SEVERAL or MANY, and takes a plural verb
Expressions of speed
When indefinite nouns are mentioned
before a vowel or vowel sound
Before a body part in a prepositional phrase that belongs to the object in the sentence
With the mane of wars
Before any noun, singular, plural, count or noncount
Special animals
With names of geographic regions
Others
When it is clear in the situation which thing or person is referred to
When something is common knowledge
When there is only ONE of something
With name of universities, collages, and school
Invetions
With words like office, movies, theater.
Before a singular noun that refers to a species or group
Before a noun that has already been mentioned
With the names of historical documents
When the name of a country or state includes the word OF, the TYPE OF GOVERMENT
The expression THE NUMBER OF refers to the group and takes a singular verb
With proper names of bridges, canals,..
Before adjectives used as nouns, or nationalities
Musical instrument
With the superlative of adjectives
Patsy Lisset Morales Ortiz Y Carla Gabriela Sosa