Rastreio envios, contanto que tenha o número do objeto.

Because in this sentence rastreio is the 1st person singular present of the verb rastrear: I track.

• (Eu) rastreio envios = I track shipments
• o rastreio = the tracking / tracking as a noun

Portuguese often allows this kind of ambiguity in isolated words, but the structure makes it clear here:

• Rastreio envios = verb + object
• O rastreio dos envios = noun phrase

So in this sentence, rastreio is definitely verbal.

Portuguese usually drops subject pronouns when the verb form already shows who the subject is.

• rastreio already means I track
• so eu is optional

You could say:

• Eu rastreio envios
• Rastreio envios

Both are correct, but the second is more natural unless you want emphasis, contrast, or clarity.

Without os, the noun is more general:

• Rastreio envios = I track shipments / I do shipment tracking
• Rastreio os envios = I track the shipments (specific ones already known)

This is similar to the difference between:

• I eat apples
  and
• I eat the apples

So the version without the article sounds more generic or service-related.

Contanto que means provided that, as long as, or on condition that.

It introduces a condition that must be met.

In this sentence:

• Rastreio envios, contanto que tenha o número do objeto.
• I track shipments, provided that you have the item number.

It is a slightly more formal or structured way to express a condition than some everyday alternatives.

Because contanto que is followed by the subjunctive, not the indicative.

• ter = to have
• tem = indicative present
• tenha = present subjunctive

Certain conjunctions automatically trigger the subjunctive in Portuguese, and contanto que is one of them.

So:

• contanto que tenha... = correct
• contanto que tem... = incorrect

This is one of the most important grammar points in the sentence.

The subject is understood, not stated explicitly. It depends on context.

Because tenha can be used for:

• eu
• você
• ele/ela
• o senhor / a senhora

In this sentence, the most likely meaning is:

• provided that you have the item number

So the hidden subject is probably você or a polite equivalent.

Portuguese often leaves pronouns out when they are easy to infer from context.

Literally, yes, objeto means object, but in postal and delivery language it often means a postal item, parcel, or mail item.

So número do objeto is a postal-service expression meaning something like:

• item number
• tracking number
• shipment number

A learner might expect número de rastreio, and that can also exist in some contexts, but número do objeto is a specific postal-style term.

So here objeto is not just any physical object; it is specialized logistics/postal vocabulary.

Yes, rastrear is understood and used, especially in logistics, shipping, and technology.

Examples:

• rastrear uma encomenda = to track a parcel
• rastrear um telemóvel = to track a mobile phone
• rastrear envios = to track shipments

In practical usage in Portugal, you may also often see nouns such as:

• rastreio = tracking
• seguimento in some service contexts, depending on the company or platform

But rastrear is perfectly normal.

Yes. Desde que can also mean provided that / as long as and is very common.

So these are both possible:

• Rastreio envios, contanto que tenha o número do objeto.
• Rastreio envios, desde que tenha o número do objeto.

The difference is mostly one of style and preference. Desde que is often more common in everyday speech, while contanto que can sound a bit more formal or emphatic.

Be careful, though: desde que can also mean since, depending on context, so learners need to rely on the sentence meaning.

It is natural and standard here because contanto que tenha o número do objeto is a conditional clause added after the main clause.

So:

• Rastreio envios, contanto que tenha o número do objeto.

This punctuation helps separate:

• main statement: Rastreio envios
• condition: contanto que tenha o número do objeto

In short, the comma is appropriate and expected.

It is grammatical and understandable, but it sounds a bit service-like, formal, or written rather than very casual.

A more conversational version might be something like:

• Posso rastrear envios, desde que tenha o número do objeto.
• Rastreio o envio se tiver o número do objeto.

The original sentence sounds a bit like customer support language, an instruction, or a service description. That does not make it wrong; it just affects the tone.

Because the sentence is not using tu.

In European Portuguese, if the speaker is addressing tu, the subjunctive form would be:

• contanto que tenhas o número do objeto

But tenha matches:

• você
• ele/ela
• o senhor / a senhora

So this sentence sounds as if it is addressing someone in a more neutral or formal way, not using tu.

This is an important point for learners of Portugal Portuguese, because tu is common in many situations, but formal or customer-facing language often avoids it.

Yes. Envios is a broad word meaning shipments, dispatches, or items sent. Depending on context, it can include:

• parcels
• packages
• postal items
• other deliveries

If someone wanted to be more specific, they might say:

• encomendas = parcels/orders
• cartas = letters

So envios is general and works well in logistics or platform language.