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A lot of English learners struggle with articles. There’s a lot of confusion about when you should use a/an and the. Let’s begin by looking at which article to use when you have one of something.

1. Whenever you are talking about one of something, it’s much more natural and more common to use a/an instead of saying one. You can replace one with a/an.

How long does it take you to get to work?
~ It takes about an hour. (instead of one hour)

I went shopping today! I bought a pair of pants and a new shirt!

My parents just bought a new house!

Does he have any pets?
~ Yes, he has a dog.

Does Mary have any children?
~ Yes, she has a boy and a girl!

Can I borrow a dollar?

*Remember that a/an are only used with singular, countable nouns!
X: I am looking for an information

2. If only one of something exists, then use the:

the sky
Look at all of the stars in the sky tonight!

the moon
In 1969, the United States was the first country to put a man on the moon.

the sun
The Earth revolves around the sun, while the moon revolves around the Earth

the United Nations
The headquarters of the United Nations is in New York City.

the government
The government has increased taxes again this year.
(*Usually there is only one government at a time, whether it is the government of a country, state, or city.)

Note some fixed expressions:

One of my friends is from Australia!
(*You can’t say ‘a of my friends…’)

…but you can say:

A friend of mine is from Australia!