"An" is an indefinite article used before vowel sounds (like intelligent).
Articles help specify nouns — a, an, and the are the three types.
"A" is used before words that start with a consonant sound.
"Ali is a good boy".
وہ ایک اچھا لڑکا ہے۔
"The" is used when referring to a specific item already known to the speaker and listener.
In this sentence, "the jacket" refers to a particular jacket that was bought at the mall.
"The Day of Silence" refers to a specific event, making "The" the correct article.
It indicates a particular day that is significant to the context.
We use "the" before specific or known nouns, like "the sky", which is unique and already known to the listener.
"The sky" refers to something definite, hence "the" is the correct article.
English has two articles: the and a/an.
The is used to refer to specific or particular nouns; a/an is used to modify non-specific or non-particular nouns.
We call the the definite article and a/an the indefinite article.
For example, if I say, "Let's read the book," I mean a specific book.
The Nuclear Technology Center of Isfahan is a nuclear research facility that currently operates four small nuclear research reactors, all supplied by China.
It is run by the AEOI.