"Did you all work yesterday?"

Translation: Avete lavorato ieri?

[gerry11111]

Shouldn't this past participle form agree in number and gender with the subject (ie, shouldn't it be lavorati, lavorate)?

[Alipaulam]

No, that's only when a verb takes essere rather than avere.

The only time you change the endings of the past participle with verbs taking avere is when you have a preceding direct object, when the ending agrees with that object, as in, L'ho trovata, I have found her, or, Li ho trovati, I have found them.

[madmcmurphy]

Eh... And where is the word "all" in the correct translation "Avete lavorato ieri?"?

[Alipaulam]

It's an Americanism. They often say 'you all' when they mean 'you' plural. It doesn't have the emphasis 'did all of you (no slackers) work yesterday' that it would in British English.