Na rubuta lambar bibiya.

In this sentence, na is the normal 1st-person singular perfective subject marker. Hausa often combines the subject with the aspect marker, so na rubuta means I wrote / I have written.

Ni is the independent pronoun I / me, and it is more often used for emphasis or contrast. For example, Ni na rubuta lambar bibiya would mean I wrote the tracking number, with extra emphasis on I.

It can mean either, depending on context.

The Hausa form here is perfective/completive, so it shows that the action is completed. In English, that may be translated as:

• I wrote
• I have written

The surrounding context decides which one sounds best.

Not exactly. Rubuta is the verb write, and the past/completed meaning in this sentence mainly comes from na, not from changing the verb the way English changes write to wrote.

So Hausa does not work exactly like English here:

• English: the verb changes
• Hausa: the subject-aspect marker often carries the tense/aspect information

That is why rubuta stays the same in many different sentences.

Because Hausa uses a linking form when one noun is connected to another.

Here:

• lamba = number
• bibiya = tracking, tracing, following

When lamba is followed by another noun in this kind of of relationship, it becomes lambar. So:

• lambar bibiya = tracking number
• literally, something like number of tracking

The -r is the linker here.

Bibiya literally has the idea of following, tracing, or tracking.

So lambar bibiya is a number used for tracking something, such as a parcel or shipment. In natural English, that is usually translated as tracking number.

Hausa often does not use a separate article the way English does. So a phrase like lambar bibiya can mean:

• a tracking number
• the tracking number

The context usually makes it clear which one is meant. In many real situations, English translators choose the tracking number because it refers to a specific number already known in the conversation.

In this sentence, it is quite similar:

• Na = I
• rubuta = wrote / have written
• lambar bibiya = tracking number

So the basic order is:

subject marker + verb + object

That feels close to English I wrote the tracking number, although grammatically na is doing more work than just a simple English pronoun.

With something like a number, rubuta is very naturally understood as write down or note down.

So in practice, Na rubuta lambar bibiya can be understood as:

• I wrote the tracking number
• I wrote down the tracking number

English may choose the more natural wording depending on the situation.

You can say:

Ban rubuta lambar bibiya ba.

This means I did not write the tracking number or I have not written the tracking number.

In this negative pattern:

• ban is the negative 1st-person singular perfective form
• ba appears again at the end

So the negative is built differently from the positive.

You can add the independent pronoun:

Ni na rubuta lambar bibiya.

That gives extra emphasis to I, as in:

• I wrote the tracking number
• It was I who wrote the tracking number

So this is one place where ni appears naturally, but the basic non-emphatic sentence is still Na rubuta lambar bibiya.