what is the difference gramtically between these two sentences

Question

Necesitamos sillas más cómodas.
Se necesitan sillas más cómodas.

Answer 1

This is the difference between using the ACTIVE voice = Necesitamos sillas = WE need seats. A person is the subject = we

PASSIVE voice = Se necesitan sillas. Now the subject is "chairs" are needed. (you don't know by WHOM)

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