Chapter I. The article 1 the definite and indefinite article

Incorrect
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He was a honest student.
Correct
He was an honest student.
The article “an” is used because as the first letter of the following noun is a consonant pronounced with a vowel sound.
Incorrect
An URL for the survey will be sent to the participants of research.
Correct
A URL for the survey will be sent to the participants of research.
The article “a” is used because the first letter of the following word, or acronym, is a vowel pronounced with a consonant sound.

Using indefinite articles with uncountable nouns

Uncountable nouns refer to nouns that cannot be counted (or would be so difficult to count that they are treated similar to a singular noun). For example, intangible liquid things such as air and water, and things that are impossible to count such as rice and sand, are all uncountable nouns. Indefinite articles (“a” and “an”) typically cannot be used with uncountable nouns.
Incorrect
Would you like to have a wine?
Correct
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Would you like to have some wine?
“Wine” is an uncountable noun and thus does not include an indefinite article.
However, certain uncountable nouns can sometimes be colloquially treated as countable nouns. Such nouns are usually preceded by an indefinite article.
Correct
I will have a coffee.
“A coffee” means “a cup of coffee”.
Correct
Be careful not to make a noise.
“Make a noise” is an idiom that always takes an indefinite article.

How to Use an Article Before an Adjective?

Just as a noun is modified by an article, an adjective modifying a noun is often preceded by an article. In such cases, the article typically comes first followed by the adjective and noun.
Example
Developing a strong research question requires spending significant time on preliminary investigation.

Articles with Pronouns

An article and a possessive pronoun cannot be used together to modify
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the same noun. This is because both articles and pronouns indicate specificity, and using them together would cause confusion. Possessive pronouns are somewhat more specific than articles, so if you want to refer to something that belongs to someone, a pronoun is often the best choice.