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Vuestras piernas son fuertes y rápidas.

Vuestras piernas son fuertes y rápidas.
Your legs are strong and fast.
From Lesson 65:The Human Body: Legs and Health·Spanish (Spain)

Breakdown of Vuestras piernas son fuertes y rápidas.

ser
to be
y
and
fuerte
strong / loud
rápido
fast
vuestro
your (plural)
la pierna
the leg

Questions & Answers about Vuestras piernas son fuertes y rápidas.

Why is the word for "your" vuestras instead of tus or vuestros?
Vuestro is used in Spain for "your" when you are talking to multiple people (like "you all"). Possessive words must match the noun they describe. Since piernas (legs) is feminine and plural, the word becomes vuestras.
Can I use sus instead of vuestras?
Yes, you can use sus if you are speaking formally to a group (using ustedes) or if you are speaking Spanish from Latin America. In Spain, however, vuestras is the standard way to say "your" when talking to a group of people you know informally.
Why does the sentence use son (from ser) instead of están (from estar)?
We use the verb ser for traits and characteristics. Because being strong (fuertes) and fast (rápidas) describes the permanent or fundamental qualities of the legs, we use son. If you were saying the legs were temporarily tired, you would use están.
Vuestras, piernas, and rápidas all end in "-as". Why doesn't fuertes end in "-as" too?
Adjectives that end in "-o" in the singular change to "-a" to match feminine nouns. But the singular word for "strong" is fuerte. Adjectives ending in "-e" don't change based on gender, they only add an "-s" to show they are plural. So it is always fuertes for both masculine and feminine plural nouns.

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