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An article is a word that combines with a noun to indicate the type of reference being made by the noun.

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a lb or an lb, which is right?

I wouldn't generally use the abbreviation in a sentence. The letters "lb" are a unit and are used with a number. So it is valid to write "1 lb" or "5 m" or "1.4 kg", but you shouldn't write "I'll hav …
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English Articles: Perilla oil is an/the edible vegetable oil derived from perilla seeds

Your natural sense is correct. There is a subtlety. If we ask the question: What edible oil is derived from perilla seeds? Perilla oil is the edible vegetable oil derived from perilla seeds wou …
David's user avatar
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