vs 

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"Three years" is a phrase which is often translated as "tres años", and "one year" is a phrase which is often translated as "un año". Learn more about the difference between "three years" and "one year" below.
three years(
thri
 
yirz
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. tres años
I met my boyfriend three years ago.Conocí a mi novio hace tres años.
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one year(
wuhn
 
yir
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. un año
In one year, we've moved three times!En un año, nos hemos mudado tres veces!
a. un curso escolar
After one year, you'll graduate.Después de un curso escolar, vas a graduarte.
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