Usipoifunga zipu ya begi lako, vitabu vyako vinaweza kupotea.

It breaks down as u-si-po-i-funga:

• u- = you singular
• -si- = negative
• -po- = if / when
• -i- = object marker meaning it, referring to zipu
• funga = close / fasten

So usipoifunga means if you do not fasten it.

The -i- is an object marker that agrees with zipu. Since zipu is a specific thing, Swahili often includes an object marker for it inside the verb.

So the verb already says fasten it, and then zipu is named explicitly afterward.

This is very common in Swahili when the object is definite or clearly identifiable. In many situations, usipofunga zipu is also possible, but usipoifunga zipu sounds more specific.

Because zipu here is singular. It belongs to noun class 9 in the singular, and class 9 commonly uses i- as its object or subject agreement.

The plural form would belong to class 10, which often uses zi-.

So:

• singular: zipu → i-
• plural: class 10 noun → zi-

The ya is the linking word meaning of, but in Swahili it changes form to agree with the noun before it.

Here the noun before it is zipu, and for that noun class the connector is ya.

So:

• zipu ya begi lako = the zipper of your bag

Because possessives in Swahili agree with the noun being possessed, not with the owner.

Here, the possessed noun is begi, and begi is treated as a class 5 noun. Class 5 uses l- with the possessive stem -ako, giving lako.

So:

• begi lako = your bag

Compare:

• kitabu chako
• begi lako
• nyumba yako
• vitabu vyako

The form changes depending on the noun class.

Because vitabu is a class 8 plural noun. Possessives must agree with that class, so your books becomes vitabu vyako.

The vy- matches the noun class of vitabu.

So:

• kitabu chako = your book
• vitabu vyako = your books

It breaks down as vi-na-weza:

• vi- = they, for class 8 nouns like vitabu
• -na- = present tense
• weza = be able / can

So vinaweza means they can.

Since the subject is vitabu vyako, the verb has to agree with vitabu, which is why it uses vi-.

After -weza, Swahili normally uses an infinitive.

So:

• vinaweza kupotea = they can get lost

Here ku- is the infinitive marker, similar to to in English.

They are related, but not the same:

• kupotea = to get lost, to be lost, to disappear
• kupoteza = to lose something

In this sentence, the books themselves may end up lost, so kupotea is the correct choice.

Not here. The idea of if is built into the verb by -po-.

So usipoifunga already includes the sense if you do not fasten it.

This is a very normal Swahili pattern. The conditional idea is often expressed inside the verb rather than with a separate word.

Yes, that is also possible.

Without the object marker -i-, the sentence still works:

• Usipofunga zipu ya begi lako...

With the object marker, it sounds a bit more specific:

• Usipoifunga zipu ya begi lako...

Both are understandable, but the version with -i- is very natural when talking about a specific zipper.

This sentence is a good example of Swahili agreement:

• zipu is class 9, so you see i- in usipoifunga and ya in zipu ya...
• begi is class 5, so you get lako
• vitabu is class 8, so you get vyako and vi- in vinaweza

So one big lesson from this sentence is that many small words and prefixes change to match the noun class.

Yes. Both are borrowed from English:

• zipu from zipper
• begi from bag

Even though they are loanwords, they still behave like normal Swahili nouns and follow Swahili agreement patterns.