#1. No article is necessary before an uncountable noun which is used in an indefinite sense, i.e., in a non-unique, non-specific and non-defined way.
Example: Some people prefer water to coffee every morning.
"The" is necessary before an uncountable noun which is used in a definite sense.
Example: The water in this town is famous for its purity.
Never use "a" or "an" before an uncountable noun.
Example (incorrect): a happiness
#2. No article is necessary before a plural noun which is used in an indefinite sense.
Example A: Do you have siblings?
Example B: There are stars in the sky.
#3. No article is necessary before the names of streets, avenues, roads, lanes, or boulevard.
Example: I live on Eighth Ave. We are at Main Street.
#4. No "the" is necessary after some, most, all, many, much, and there is/are. But "the" is necessary if preceded by some of, most of, all of, many of, much of. Prepositional phrases with "of" makes a noun definite. Therefore "the" is used.
Example: Many people showed up yesterday. Many of the people I know showed up yesterday.
#1. Depending on the phrase and the meaning, the same noun can be countable in some situations and uncountable in others.
Example A: Our helicopter is running out of fuel. Gas is a fuel made from petroleum.
Example B: My sister loves cheese. Brie is a soft and rich French cheese.
Example C: Time is precious. We had a wonderful time at the holiday party.
#2. Indefinite use of noun includes the following situations: a) The noun was used as a generic reference; b) The noun was not mentioned before in the context; c) The noun was not known to the speaker as a particular item; d) The noun was not part of a phrase; and e) The noun was not defined by a phrase or clause.
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