Copiamos el número de bastidor y el kilometraje.

Because with regular -ar verbs, the nosotros form is the same in the present indicative and the preterite.

• copiamos = we copy / we are copying
• copiamos = we copied

So the sentence could mean either:

• We copy the chassis number and the mileage
• We copied the chassis number and the mileage

The intended meaning usually comes from context. In instructions, procedures, or narration of steps, Spanish often relies on context rather than changing the form here.

Spanish usually omits subject pronouns when the verb ending already shows who the subject is.

• Copiamos already tells you the subject is we
• So Nosotros copiamos... is possible, but usually unnecessary

You would add nosotros only for emphasis, contrast, or clarity:

• Nosotros copiamos el número de bastidor, no ellos.
  We copy the chassis number, not them.

In Spain, número de bastidor is the usual term for the vehicle’s VIN or chassis number.

Literally:

• número = number
• bastidor = chassis / frame

So it is not just any number related to a car; it specifically refers to the identifying number of the vehicle’s frame/chassis.

Spanish often uses noun + de + noun where English might use a noun as an adjective.

So:

• número de bastidor = chassis number
• literally, number of chassis/frame

This de structure is extremely common in Spanish:

• número de teléfono = phone number
• tarjeta de crédito = credit card
• puerta del coche = the car door

So de bastidor tells you what kind of number it is.

The article el applies to the whole coordinated phrase:

• el número de bastidor y el kilometraje

In this sentence, Spanish includes el before both nouns because they are treated as two specific items:

• el número de bastidor
• el kilometraje

If you mean both specific things, repeating the article is very normal and often the clearest option.

A speaker might sometimes omit the second article in other contexts, but here el ... y el ... sounds natural and precise.

Because kilometraje is a masculine noun: el kilometraje.

Many nouns ending in -aje are masculine:

• el viaje
• el garaje
• el paisaje
• el kilometraje

So even though the ending may not look obviously masculine to an English speaker, the correct article is el, not la.

They are related, but not identical.

• kilómetros = kilometres, the unit of distance
• kilometraje = mileage, total distance registered or travelled

In a vehicle context:

• Tiene 80.000 kilómetros = It has 80,000 kilometres
• Comprobamos el kilometraje = We check the mileage

So kilometraje is the better word when talking about the odometer reading or a vehicle’s recorded distance.

Yes, but in Spanish copiar can naturally mean to copy down, to write down, or to transcribe information.

So in this context, copiamos el número de bastidor y el kilometraje means something like:

• we write down the chassis number and mileage
• we copy down the chassis number and mileage

This is broader than the most basic English idea of copy.

The normal word order in Spanish is:

• verb + object
• Copiamos el número de bastidor y el kilometraje

This is the most neutral, standard order.

You could change the order for emphasis, but it would sound more marked:

• El número de bastidor y el kilometraje los copiamos.

That version emphasizes the things being copied. In most ordinary contexts, the original sentence is the natural choice.

In standard Peninsular Spanish, it is approximately:

• bah-stee-DOR

A bit more closely:

• ba as in father
• sti with a clear s + t
• dor with the stress on the last syllable

The full phrase:

• número de bastidor

is pronounced roughly:

• NOO-me-ro de bah-stee-DOR

The r in número and bastidor is a tapped Spanish r, not an English r.

Yes, very naturally.

Spanish often uses the first person plural for procedures, instructions, and step-by-step descriptions, especially in formal, technical, or workplace contexts. It can sound like:

• we do this
• next we do that

So Copiamos el número de bastidor y el kilometraje may describe:

• a step in an inspection process
• a workshop procedure
• an administrative checklist

In English, this is often translated more naturally as an instruction:

• We record the chassis number and the mileage
• Next, we write down the VIN and the mileage

Yes, depending on the nuance.

• copiamos suggests copying from a source
• anotamos suggests writing down / noting

In many practical contexts, both could work:

• Copiamos el número de bastidor y el kilometraje
• Anotamos el número de bastidor y el kilometraje

If the idea is that you are transferring the information exactly from a document, label, or odometer, copiamos fits especially well. If the idea is simply recording the information, anotamos may sound slightly more natural in some contexts.