In the following sentence:
Peter hears a noise in the middle of the night.
1- Why did the author use "a" before the uncountable noun "noise"?
2- Does the indefinite article add to or change the meaning of (noise) in any way?
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Abstract nouns may be either countable (idea, hour) or uncountable (kindness, sadness). Sometimes abstract nouns can become class nouns (a noise is regarded as one of its class). This change is marked by the use of the article and of the plural number: much noise, a noise of a hammer, different noises. Moreover, an abstract noun is used with the indefinite article when it denotes a certain kind of a quality, feeling, state, etc. "Peter hears a noise, which can't be heard by others", "Peter has a cleverness quite of his own", "Peter has an eagerness, which could hardly be seen without taking a delight in feeling that it makes him happy."