Zero article refers to when a noun is NOT preceded by a, an or the (which are all three known as articles). This, however, is not a random omission. Like everything else in grammar, the zero article, or absence of one of the three articles before a noun, is governed by rules:
1) Use a zero article when the exact one or ones is not known.
For example: People should understand how their government functions. (We do not know which people should understand. Which is not specified. If we did know, we might write, The people of France should understand how their government functions.)
Lodeche's economy is in trouble. Monies are needed for the survival of the republic. (We do not know the exact monies, but we do know the exact republic.)
2) Use a zero article (no article at all) with proper nouns.
For example: Sally Jane skips down Langston Street, turns the corner at Hughes Department Store, and spits into Calloway Creek. (Without proper nouns, we would use articles and the sentence would read, A girl skips down the street, turns the corner at the department store, and spits into the creek.)
Tomorrow: We breathe a sigh of relief and rest.
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