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Ustedes necesitan firmar el documento para la reserva.

Ustedes necesitan firmar el documento para la reserva.
You need to sign the document for the reservation.
From Lesson 55:Formal address (usted, ustedes)·Spanish (Spain)

Questions & Answers about Ustedes necesitan firmar el documento para la reserva.

Why do we use ustedes here instead of vosotros?
In Spain, ustedes is the formal way to say the plural 'you'. You use it when speaking to a group of people you do not know well, in professional settings, or to show respect (like addressing clients at a hotel). If you were talking to a group of friends, you would use the informal vosotros instead.
Why does ustedes use necesitan, which usually means 'they need'?
The formal 'you' pronouns, usted (singular) and ustedes (plural), always borrow the third-person verb endings (he/she/they). So, even though ustedes means 'you all', it pairs with the 'they' form of the verb: ustedes necesitan.
Why is firmar not conjugated to match the subject?
When you have two verbs working together like this, only the first one is conjugated. Since we already matched the first verb (necesitan) to our subject (ustedes), the second verb (firmar, meaning 'to sign') must stay in its basic, unchanged dictionary form (the infinitive).
Why do we use para instead of por to say 'for' in this sentence?
In Spanish, para is used to show a specific purpose or goal. Here, you are signing the document for the explicit purpose of securing the reservation (la reserva), so para is the correct choice.

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