Seli nyingi zinaonekana.

A useful breakdown is:

• seli = cell / cells
• nyingi = many
• zi-na-onekana
  • zi- = subject marker for a class 10 plural noun
  • -na- = present tense
  • -onekana = be visible / appear / be seen

So the structure is basically:

cells + many + they-are-visible

That is why the sentence means something like Many cells are visible or Many cells can be seen.

Because in Swahili, adjectives normally come after the noun they describe.

So:

• seli nyingi = many cells
• literally: cells many

This is very normal Swahili word order. English usually puts adjectives before the noun, but Swahili usually puts them after.

Because adjectives in Swahili must agree with the noun class of the noun they describe.

The adjective stem here is -ingi = many / much, but its beginning changes depending on the noun class.

With seli, the correct agreeing form is nyingi.

Compare:

• vitabu vingi = many books
• maji mengi = much/a lot of water
• miti mingi = many trees
• seli nyingi = many cells

So nyingi is not a different word from -ingi; it is the noun-class agreement form that matches seli.

zi- is the subject marker that matches the noun seli in the plural.

In Swahili, the verb usually shows what kind of noun the subject is. So instead of adding a separate word like they, Swahili often builds that information into the verb.

Here:

• zi- = they for this noun class
• -na- = present tense
• -onekana = be visible / appear

So zinaonekana means they are visible.

You would say:

Seli inaonekana.

The noun seli itself often stays the same in singular and plural, but the verb agreement changes:

• Seli inaonekana. = The cell is visible.
• Seli zinaonekana. = The cells are visible.

So one important clue to singular vs. plural is the verb:

• i- = singular
• zi- = plural

Yes. Seli is one of many Swahili nouns, especially loanwords, whose form can stay the same in singular and plural.

That means:

• seli = cell
• seli = cells

So how do you know whether it is singular or plural? Usually from:

• the verb agreement
• the context
• words like nyingi = many

In this sentence, zinaonekana clearly shows a plural subject.

It can cover several close meanings depending on context:

• are visible
• can be seen
• appear

In this sentence, the most natural English is usually are visible or can be seen.

So zinaonekana is not just a mechanical word-for-word match; its best English translation depends on the situation.

Not exactly in the simplest sense.

• kuona = to see
• the ordinary passive is kuonwa = to be seen
• kuonekana is a very common related form meaning to be visible / to appear / to be seen

So in real Swahili, kuonekana is often the natural choice when you mean something like be visible.

That is why Seli nyingi zinaonekana sounds natural for Many cells are visible / can be seen.

-na- is the present tense marker.

So:

• zi- = they
• -na- = present
• onekana = be visible / appear

Together, zinaonekana means they are visible or they appear.

With many verbs in Swahili, -na- can feel like English are ...-ing, but with a verb like onekana, English usually translates it as a simple present state: are visible.

Because Swahili usually puts the subject information inside the verb.

In English, you say:

• They are visible

In Swahili, that idea is packed into:

• zi-na-onekana

where zi- already means something like they for this noun class.

So a separate subject pronoun is usually unnecessary unless you want extra emphasis.

Swahili does not use articles the way English does.

So seli can mean:

• a cell
• the cell
• cell
• cells
• the cells

depending on context.

In this sentence, nyingi and zinaonekana make it clear that the meaning is plural: many cells.

English forces you to choose articles more often; Swahili usually does not.

A simple pronunciation guide is:

zi-na-o-ne-ka-na

Each vowel is usually pronounced clearly:

• zi = zee
• na = nah
• o = oh
• ne = neh
• ka = kah
• na = nah

Swahili stress is usually on the second-to-last syllable, so the stress falls on ka:

zi-na-o-ne-KA-na

So the whole sentence is approximately:

SE-li NYIN-gi zi-na-o-ne-KA-na