Non si è filata la paglia, ma la lana.

Questions & Answers about Non si è filata la paglia, ma la lana.

Why do we use è instead of ha? Doesn't the verb "to spin" normally take avere?
Yes! The verb filare (to spin) is transitive and normally takes avere in compound tenses (for example, ho filato, meaning "I spun"). However, when you use the impersonal si construction, the auxiliary verb automatically shifts to essere.
Why does the past participle end in -a (filata)?
It is agreeing with la paglia (the straw), which is a feminine singular noun. When an impersonal si is used with an explicit object, the sentence basically becomes passive (often called the passive si or si passivante). The object acts as the grammatical subject, so the past participle must agree with its gender and number.
How would the sentence change if we were talking about spinning plural things, like clothes (i vestiti)?
Because of the passive si rule mentioned above, the verb and past participle would both have to agree with the plural noun. You would say Non si sono filati i vestiti. The auxiliary shifts to the plural sono, and the participle ends in -i.
Could we put la paglia before the verb instead?
Yes, you could say La paglia non si è filata, but putting the noun after the verb is very common in Italian with the passive si. It sounds completely natural and helps set up the strong contrast at the end of the sentence between the straw and the wool (la lana).

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