Kama ungekuwa umepata bisibisi jana, ungeweza kufunga skrubu zile ndogo.

It is a past unreal / counterfactual conditional.

The speaker is talking about:

• something that did not happen in the past: you did not get a screwdriver yesterday
• and an imagined result: so you did not manage to fasten those small screws

In natural English, this is the kind of pattern translated as:

• If you had gotten a screwdriver yesterday, you would have been able to fasten those small screws.

Kama means if.

It introduces the condition:

• Kama ungekuwa umepata bisibisi jana = If you had gotten a screwdriver yesterday

It is one of the most common and natural ways to form if-clauses in everyday Swahili.

This is one of the most important parts of the sentence.

Breakdown

• u- = you
• -nge- = conditional marker, often giving a meaning like would
• -kuwa = be
• u-me-pata = you have gotten / you got

So:

• ungekuwa umepata literally looks like you would be having gotten
• but in real usage it means you would have gotten / if you had gotten

This is a common Swahili way to express a past counterfactual condition:

• conditional form of kuwa
• plus
• perfect form of the main verb

Because ungekuwa umepata makes the past completed counterfactual meaning clearer.

Compare

• ungepata = you would get / you would obtain
• ungekuwa umepata = you would have gotten / if you had gotten

So in this sentence, ungekuwa umepata is better for showing that the imagined getting happened before the imagined result.

Ungeweza comes from kuweza, which means to be able / can.

Breakdown

• u- = you
• -nge- = conditional
• -wez- = root from kuweza

So:

• ungeweza = you would be able
• in this past unreal context, it is understood as you would have been able

That is why:

• ungeweza kufunga = you would have been able to fasten

Because the sentence emphasizes ability, not only the action.

Compare

• ungefunga skrubu = you would fasten the screws
• ungeweza kufunga skrubu = you would be able to fasten the screws

The idea is that the screwdriver would have made it possible. So kuweza is a very natural choice.

Yes, kufunga can mean to close or to shut, but it also has a broader sense of:

• to fasten
• to secure
• to tighten

With screws and a screwdriver, the meaning is clearly to fasten / tighten.

So here:

• kufunga skrubu = to fasten / tighten screws

Yes. They are common loanwords in Swahili.

• bisibisi = screwdriver
• skrubu = screw

Swahili contains many borrowed words, especially for:

• tools
• technology
• modern objects
• trade items

So a learner should not be surprised to see words that sound non-Bantu in everyday Swahili.

This is about noun class agreement.

Skrubu is treated as an N-class noun, and the words that describe it must agree with that class.

In this phrase

• skrubu = screws
• zile = those
• ndogo = small

So:

• skrubu zile ndogo = those small screws

Why zile?

For this noun class, the plural demonstrative those is zile.

Why ndogo?

The adjective -dogo changes to match the noun class, giving ndogo here.

Because in Swahili, modifiers usually come after the noun.

So instead of English order:

• those small screws

Swahili naturally says:

• skrubu zile ndogo
• literally: screws those small

This noun-first pattern is very common in Swahili.

Jana means yesterday.

It appears after bisibisi because it belongs with the idea of getting the screwdriver:

• ungekuwa umepata bisibisi jana = if you had gotten a screwdriver yesterday

That word order is very natural in Swahili. Time expressions like jana are fairly flexible, but this placement sounds normal and clear.

Yes, but kama is the most common everyday choice.

Other words such as ikiwa or iwapo can also introduce conditions, but they may sound:

• more formal
• more literary
• or less common in ordinary conversation

For this sentence, kama is the most natural and straightforward option.

In form, ungeweza is basically would be able.

But in this sentence, the whole construction is clearly about an unreal past situation, so the natural English translation becomes:

• you would have been able

This is common when translating Swahili conditionals: the past meaning is often understood from the whole sentence, not always from a separate word that exactly matches English have.