Yo compro unas motos.

Questions & Answers about Yo compro unas motos.

Why is it unas motos instead of unos motos if the word ends in "-os"?
The word moto is actually short for motocicleta, which is a feminine word. Even though it is shortened to end in "-o", it keeps its feminine gender. That is why we use the feminine article unas to say "some motorcycles." It is a very common exception, just like la foto (from fotografía)!
Do I always have to use yo before compro?
No, you can just drop it and say compro unas motos. In Spanish, the "-o" ending on compro already tells us that "I" am the one buying. Using yo is optional and is usually just added for a little extra emphasis.
How does unas mean "some"? I thought una meant "a" or "one".
You are exactly right that una means "a" or "one". When you make indefinite articles plural (unos or unas), they translate to "some" or "a few." So while una moto is "a motorcycle," unas motos translates perfectly to "some motorcycles."

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