Taka zinazooza na taka zisizooza ni nyingi.

Taka means waste, garbage, or refuse.

It is repeated because the sentence is contrasting two types of waste:

• taka zinazooza = waste that decomposes
• taka zisizooza = waste that does not decompose

Repeating taka makes the contrast very clear. In some contexts, the second taka could be omitted if it is already understood, but repeating it is very natural.

Zinazooza can be broken down like this:

• zi- = agreement prefix for the noun class of taka here
• -na- = present tense
• -zo- = relative marker meaning that/which
• -oza = verb stem from kuoza, to rot / decompose

So zinazooza literally means something like that are decomposing or that decompose.

Because it is the negative form.

A simple breakdown is:

• zi- = noun-class agreement
• -si- = negative
• -zo- = relative marker that/which
• -oza = decompose / rot

So zisizooza means that do not decompose.

This is a very common Swahili pattern: the idea of not is built directly into the verb form.

Because they must agree with taka.

Swahili uses noun classes, and words that describe or refer to a noun usually have to match that noun’s class. Here, taka is taking class 10 agreement, so you see:

• zi- in zinazooza
• zi- in zisizooza
• nyingi later in the sentence, which also agrees with the same noun class

So the matching forms are not random; they are required by Swahili agreement.

Because many/much in Swahili changes form to match the noun class.

The adjective stem is -ingi, but its full form depends on the noun it describes. With taka in this sentence, the correct agreeing form is nyingi.

For comparison:

• maji mengi = much/a lot of water
• vitabu vingi = many books
• ndizi nyingi = many bananas
• taka nyingi = much/a lot of waste, many waste items

So nyingi is the agreement form that fits taka here.

Ni nyingi means are many or are a lot.

Here:

• ni works like is/are
• nyingi = many / much / a lot, with the right noun-class agreement

So the whole sentence ends by saying that these kinds of waste are numerous or are abundant.

This is a very common learner question.

In Swahili, not all nouns change form the way English nouns do. Many nouns in the N-class can look the same in singular and plural, and sometimes a noun is used in a more collective sense.

So taka can refer to waste as a mass/collective idea, and the agreement in the sentence shows how it is being treated grammatically. Here, the agreement is plural/class 10:

• zinazooza
• zisizooza
• nyingi

That is why the other words tell you more about the grammar than the noun’s shape by itself.

It can do both, depending on context.

Literally, zinazooza is a present relative form, so it can mean that are decomposing. But in real usage, it can also describe a general type of waste: waste that does decompose.

So in a sentence like this, it often works very naturally as biodegradable waste, even though the wording is more literally waste that decomposes.

The same idea applies to zisizooza: it can mean waste that does not decompose, i.e. non-biodegradable waste.

Because two o sounds come together when the parts of the word combine.

For example:

• -zo-
  • -oza → zooza

So the spelling keeps both vowels. You do not remove one of them.

When speaking, it often sounds like a slightly longer o sound rather than two completely separate syllables.

In Swahili, a relative description like that decompose normally comes after the noun it describes.

So:

• taka zinazooza = waste that decomposes
• taka zisizooza = waste that does not decompose

This is the normal order. English also puts relative clauses after the noun, so this part is actually quite familiar once you see how the Swahili verb is built.