Firmi e metta il timbro qui.

Questions & Answers about Firmi e metta il timbro qui.

Why does firmare become firmi and mettere become metta here?
These are formal commands, used when addressing someone respectfully as Lei. In the formal imperative mood, the endings swap compared to the normal present tense: -are verbs take an -i ending (like firmi), while -ere and -ire verbs take an -a ending (like metta).
Wait, doesn't firmi normally mean 'you sign' for the informal tu?
Yes, in the regular present tense, tu firmi means 'you sign.' But in the imperative (command) mood, the rules change! For formal commands, -are verbs switch to an -i ending, so firmi! means 'Sign! (formally)'. If you wanted to command a friend, you would use the informal imperative: firma!.
Does il timbro refer to a postage stamp for a letter?
No, il timbro refers to a rubber ink stamp or official seal, which makes sense here since you are signing a document. If you need a postage stamp to mail a letter, you would use the word francobollo.
How would I say this exact sentence informally to someone I know well?
You would swap both verb endings to their informal command forms. It would be Firma e metti il timbro qui. Notice how the -are verb takes an -a and the -ere verb takes an -i, which is the exact opposite of the formal commands used in this sentence.

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