Explanation

"The" is used for a specific person or thing known to the speaker and listener.

"Boy in red shirt" is a specific boy, so "The" is appropriate.

Explanation

Explanation

"An" is an indefinite article used before vowel sounds (like intelligent).

Articles help specify nouns — a, an, and the are the three types.

Explanation

"Old" starts with a vowel sound, so we use "an" before it.

Correct sentence: "Is your mother working in an old office building?"

Explanation

We do not use an article before the names of most cities, including Peshawar.

The sentence is correct as: "Do you still live in Peshawar?"

Explanation

"The" is used for something specific already known to the speaker and listener.

Since the USB drive was already mentioned ("I lent you last week"), "the" is correct.

Explanation

"Hour" begins with a silent h, so it sounds like it starts with a vowel.

Therefore, we use "an" before "hour" — "150 miles an hour."

Explanation

"The" is used to refer to something specific or already known to the listener.

Since "blue T-shirt over there" is a specific item, "the" is the correct article.

Explanation

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.

Explanation

"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.