Volkeno ni kubwa.

Ni is the linking word meaning is/are in a simple present-tense sentence like this. It connects volkeno with the description kubwa.

So the pattern is:

noun + ni + adjective

Here, kubwa is not directly modifying the noun inside one noun phrase. It comes after ni, so it is the description in the full sentence:

Volkeno ni kubwa = The volcano is big

If you wanted big volcano as just a noun phrase, Swahili normally puts the adjective after the noun:

volkeno kubwa = big volcano

Swahili does not use articles like English a/an/the. A noun can often mean a volcano, the volcano, or even volcanoes, depending on context.

So volkeno does not need a separate word for the.

Yes, adjectives usually agree with the noun class of the noun they describe.

The basic adjective stem is often thought of as -kubwa. The form changes with different noun classes. In this sentence, volkeno takes the form kubwa.

Compare:

• mtoto ni mkubwa = the child is big
• gari ni kubwa = the car is big
• magari ni makubwa = the cars are big

So yes, agreement matters, but the correct form here is kubwa.

From the meaning you were shown, it is singular here. But this is a very good question, because many Swahili loanwords look the same in singular and plural.

That means volkeno may sometimes be singular or plural depending on context. Since ni also does not change, the whole sentence can look the same. Context tells you whether it means the volcano is big or the volcanoes are big.

Yes. In this kind of sentence, ni can correspond to English is or are.

English changes:

• is
• are

But Swahili keeps ni the same.

Not if you mean The volcano is big.

• Volkeno ni kubwa = a full sentence, The volcano is big
• volkeno kubwa = a noun phrase, big volcano

So ni is important when you are making a full statement like this.

A simple pronunciation guide is:

• Volkeno → vol-KE-no
• ni → nee
• kubwa → roughly KUB-wa

A useful rule: Swahili stress usually falls on the second-to-last syllable.

So:

• vol-KE-no
• KUB-wa

Yes, it is a loanword rather than an old native Swahili word. That is very common in Swahili, especially for scientific or international vocabulary.

Even when a word is borrowed, it still behaves like a Swahili noun in the sentence.

You can say:

Volkeno si kubwa
or
Volkeno sio kubwa

This means The volcano is not big.

Learners often first meet si as the basic negative in this kind of sentence.

Add sana after the adjective:

Volkeno ni kubwa sana

That means The volcano is very big.

You would not normally keep ni for those tenses.

For example:

• Volkeno ilikuwa kubwa = The volcano was big
• Volkeno itakuwa kubwa = The volcano will be big

So ni is mainly for this simple present-type statement.