English Translation
You worked more than I did.
Lei ha lavorato più di me. You worked more than I did.
If it is “formal you” here, as the answer suggests, shouldn’t it be “Lei hai lavorato più di me?”
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No, if the pronoun is formal, the verb has to be 3rd person.
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Thank you, I had forgotten this particular rule. So many many rules … 
Ciao! A little bit of Avere : Io ho, tu hai, lui/lei/formal Lei ha. Hope this helps. (Oops Station2Station, I came in a bit late here, mi dispiace).
Good to see you MRgK!
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Da tanto in tanto oso farlo. 
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