Na kunna sigina bayan na saka beldin mota.

Here na is the 1st person singular perfective marker. In simpler learner terms, it tells you:

• the subject is I
• the action is viewed as completed

So Na kunna means something like I turned on or I have turned on, depending on context.

Because the sentence contains two clauses, and each clause needs its own subject marker.

• Na kunna sigina = I turned on the signal
• bayan na saka beldin mota = after I put on the seat belt

So the second na is not redundant. It belongs to the second verb saka and means I there as well.

Hausa does not need an English-style had form here.

English often says:

• I turned on the signal after I had put on the seat belt

In Hausa, the word bayan already shows the sequence after, so both verbs can stay in the normal completed form:

• na kunna
• na saka

In other words, bayan does the job of showing which action happened first.

In this sentence, bayan means after.

It is a very common word with more than one use. Depending on context, it can also mean something like behind or afterwards. Here, because it is followed by a clause, it clearly has the time meaning:

• bayan na saka beldin mota = after I put on the seat belt

Because kunna commonly means switch on, turn on, light, or activate.

Hausa uses kunna for things like:

• lights
• radios
• engines
• indicators/signals

So kunna sigina is a natural way to say turn on the signal/indicator.

Saka is a broad verb. It can mean things like:

• put
• place
• insert
• wear
• put on

With clothing or something attached to the body, it often means put on or wear. So in this sentence:

• saka beldin mota = put on / fasten the seat belt

This is a common Hausa noun-linking pattern.

beldin mota literally means something like:

• belt of car
• or car belt

Idiomatic English would be seat belt.

The -n is a linker that connects the first noun to the second noun. Hausa often makes noun combinations this way, roughly like X of Y.

So:

• beldin mota = the car's belt / car belt / seat belt

It is a loanword, ultimately from English signal.

In everyday Hausa, especially in driving contexts, sigina commonly refers to a vehicle's signal or indicator. So if a learner recognizes the English source, that is helpful here.

No. In this sentence, sigina is just the noun signal/indicator.

A learner might wonder about this because some Hausa noun forms can look similar to possessive forms, but here sigina is simply the word being used for the car signal. It is not functioning as a separate my form in this sentence.

Yes. You can also say:

Bayan na saka beldin mota, na kunna sigina.

That is perfectly natural. The meaning stays the same. The difference is mainly focus:

• Na kunna sigina bayan na saka beldin mota starts with the main action
• Bayan na saka beldin mota, na kunna sigina starts with the earlier action

Because na already includes the idea of I.

In Hausa, these short subject markers often carry both:

• the subject
• the tense/aspect information

So na already means something like I + completed action.

You can add ni only if you want emphasis or contrast, for example:

• Ni na kunna sigina = I was the one who turned on the signal

But in a normal sentence, na by itself is enough.