Usipoifunga zipu ya begi lako, mswaki na dawa ya meno vinaweza kuanguka.

It can be split like this:

• u- = you (singular)
• -si- = negative marker
• -po- = if / when
• -i- = object marker meaning it
• -funga = close / fasten / shut

So usipoifunga means if you do not close it.

In this sentence, it refers to zipu.

The -i- is the object marker for zipu.

Since zipu belongs to the noun class that often uses i-/zi- agreement, the verb includes -i- to mean it. So the verb already carries the idea of close it before the noun zipu is even mentioned.

This is very normal in Swahili.

Because Swahili often allows both:

• the object marker inside the verb
• and the full noun after the verb

This is especially common when the object is specific or already understood.

So usipoifunga zipu ya begi lako is roughly like saying:

• if you don’t close it — the zipper of your bag

In natural English we would not usually repeat it that way, but in Swahili this structure is fine.

Not exactly.

Funga has a broader meaning such as:

• close
• shut
• fasten
• tie

When the object is zipu, it naturally means zip up / close the zipper.

So kuifunga zipu is basically to zip it up or to close the zipper.

This phrase means the zipper of your bag.

Here is the structure:

• zipu = zipper
• ya = of, agreeing with zipu
• begi lako = your bag

A key point is that ya agrees with zipu, the thing possessed, not with begi.

Then lako agrees with begi, because it means your bag.

So the whole phrase is:

• zipu ya begi lako = the zipper of your bag

Because possessives in Swahili agree with the noun they belong to.

Begi takes the possessive form lako for your.

So:

• begi langu = my bag
• begi lako = your bag
• begi lake = his/her bag

Even though English just says your, Swahili changes the form depending on the noun class.

This is because mswaki and dawa ya meno are two non-human nouns joined by na.

When Swahili has a combined non-human subject like that, it very often uses class 8 plural agreement as a kind of default. That is why you get:

• vi-
  • naweza = vinaweza

So:

• mswaki na dawa ya meno vinaweza... = the toothbrush and toothpaste can/may...

Even though the two nouns do not belong to the same noun class individually, the combined subject often takes vi-.

Because after kuweza (can / be able to), the next verb normally stays in the infinitive form.

So:

• vinaweza kuanguka = they can fall / they may fall

This is the same pattern as:

• anaweza kusoma = he/she can read
• tunaweza kwenda = we can go

It can be translated in several ways depending on context.

Literally, kuweza is about ability or possibility:

• can
• be able to
• sometimes may / might

In this sentence, the idea is not that the toothbrush and toothpaste have an ability of their own. It means there is a possibility that they could fall out. So in English, good translations include:

• can fall
• may fall
• might fall

Yes, literally it is something like medicine/paste of teeth, but in normal Swahili it is the standard way to say toothpaste.

• dawa = medicine / treatment / substance
• meno = teeth

So dawa ya meno is just the normal expression for toothpaste.

It is talking to one person.

You can tell from u- in usipoifunga, which is the second-person singular marker.

If you were talking to more than one person, you would use m-:

• msipoifunga zipu ya begi lenu... = if you all do not close your bag’s zipper...

So in the original sentence, the you is singular.

Yes, you very often can.

Both of these are possible:

• Usipofunga zipu ya begi lako...
• Usipoifunga zipu ya begi lako...

The version with -i- sounds a bit more explicit or specific, because the verb already refers to the zipper as it. The version without the object marker is also natural and common.

So for a learner, it is useful to recognize both patterns.