Su hermano vive en el tercer piso del edificio nuevo.

Questions & Answers about Su hermano vive en el tercer piso del edificio nuevo.

Why is it tercer and not tercero in this sentence?
The word for "third" is normally tercero. However, when it comes right before a masculine singular noun like piso (floor), it drops the final -o and becomes tercer.
Why do we use en for "on the third floor"?
In English, we say someone lives "on" a floor, but Spanish uses the preposition en to cover "in", "on", and "at". So, en el tercer piso is the natural way to say "on the third floor".
What does del mean before edificio?
del is a mandatory combination of the preposition de (of) and the masculine article el (the). Whenever de is followed directly by el, they must merge into del. Here it means "of the".
Could su hermano mean "her brother" instead of "his brother"?
Yes! The possessive adjective su can mean "his", "her", "your" (formal), or "their". We know it means "his" here from the provided translation, but without extra context it could be any of those. It stays singular as su because hermano is singular, no matter who the brother belongs to.

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