A, AN and One

Question 1

Use A before words begin with consonant sound. If the word starts with a vowel letter but the sound of a consonat, use A.

Answer 1

A university, a European, a one-parent family.

Question 2

Use AN before words that start with vowel, including H.
Use AN with abbreviations starting with the letters:
A, E,F, H, I, L M, N, O, R, S, X.

Answer 2

An orange, an Italian, an umbrella, an hour, an honor.

An MP, an FBI, an IOU, an OPEC.
BUT a NATO, a FIFA.

A history book, an historic novel.

Question 3

Use A or An to an unspecified person, or event.

Use A/AN in number and quantity expressions.

Use A…OF with possessives:
She’s a colleague of mine.

Answer 3

I really need a cup of coffee.
You never see a police officer in this part of the town.
Three times a year, half an hour, a day or so.
a few, a little.

that’s a friend of Gabriel’s.

Question 4

With singular countable noun ONE, A or An refer to one thing.

Use ONE to emphasize that there is only one thing.

Use ONE with the expression ONE…OTHER/ANOTHER.

Use ONE with the expressions: One day, one evening, one spring.

Answer 4

We’ll be in Australia for one year. (for a year).

Do you want one sandwich or two?
Are you staying only one night?

Close one eye and then the other.
Bees carry pollen from one place to another.

Hope to see you again one day.
One evening, while he was working late at the office…