Indefinite articles (a, an) can also be used to describe one
single object or a unit of measurement or time. "A" or "an"
can be used in place of the number one.
Indefinite Articles - one single object
·   She is buying an orange and two plums.
·   I saw a bear and two lions at the zoo.
·   Would you like a lump of sugar or two?
·   I have a sister and three brothers.
·   John is eating a hamburger and French
fries for lunch.
·   Sally is making cookies and an apple pie for
dessert.
Indefinite Articles - unit of measurement or time
·   He drinks a gallon of milk every day.
·   I run a mile every morning.
·   It will only take a minute.
·   The farmer is carrying a basket of apples.
·   Can I borrow a cup of sugar?
·   I will be there in an hour.
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