Tishio ni kubwa.

Ni is the linking verb, similar to is / are in English.

So:

• Tishio = threat
• ni = is
• kubwa = big / great / serious

In simple identification or description sentences like this, ni connects the subject to what is being said about it.

In Swahili, adjectives normally come after the noun they describe.

So the natural order is:

• tishio kubwa = a big threat

And when you turn that into a full sentence, you get:

• Tishio ni kubwa = the threat is big / serious

This is different from English, where adjectives usually come before nouns.

Because tishio belongs to a noun class that takes this adjective form in the singular.

Tishio is a class 5 noun. With class 5 singular nouns, -kubwa appears as kubwa.

A useful comparison:

• tishio ni kubwa = the threat is big
• matishio ni makubwa = the threats are big

So the plural changes both the noun and the adjective:

• tishio → matishio
• kubwa → makubwa

Tishio is in noun class 5, and its plural is matishio in class 6.

This matters because Swahili words often have to agree with the noun class. That affects:

• adjectives
• some pronouns
• verbs in many sentences
• demonstratives and other modifiers

So learning the noun class helps you build correct sentences around the noun.

Swahili normally does not use articles like English a, an, the.

So tishio can mean:

• a threat
• the threat

The exact meaning depends on context.

That is very normal in Swahili, so you should not expect a separate word for the or a in sentences like this.

No. Kubwa can refer to physical size, but it is also often used more broadly to mean:

• great
• major
• serious
• large

With tishio, the meaning is usually not about physical size. It is more likely something like:

• a serious threat
• a major threat
• a great threat

So the exact English translation depends on context.

A simple pronunciation guide is:

• Tishio = tee-SHEE-oh
• ni = nee
• kubwa = KOO-bwah

A few helpful points:

• ti sounds like tee
• sh sounds like sh in shoe
• Swahili vowels are usually pronounced clearly and separately
• kwa / bwa keeps both consonants audible

So try saying it smoothly as:

tee-SHEE-oh nee KOO-bwah

They are related, but they are not the same thing.

• tishio kubwa = a big/serious threat
  This is just a noun phrase, not a full sentence.
• Tishio ni kubwa = The threat is big/serious
  This is a complete sentence.

So if you want to describe the threat inside a larger phrase, use tishio kubwa.
If you want a complete statement, use Tishio ni kubwa.

In a normal full sentence like this, you should usually keep ni.

So:

• Tishio ni kubwa = correct standard sentence

If you remove ni:

• Tishio kubwa

that usually stops being a full sentence and becomes just a noun phrase, meaning a big/serious threat.

For a learner, the safest choice is to use ni in this kind of sentence.

You can replace ni with si:

• Tishio si kubwa.

This means:

• The threat is not big
• The threat is not serious

So in this kind of sentence:

• ni = is
• si = is not

You would use the plural noun and the plural adjective agreement:

• Matishio ni makubwa.

Changes:

• tishio → matishio
• kubwa → makubwa

So this is a good example of how noun class affects adjective form in Swahili.

That would usually not be the normal way to say this idea.

The straightforward pattern is:

• noun + ni + adjective

So:

• Tishio ni kubwa = normal and clear

Putting kubwa first would sound unusual and would not normally express the same basic meaning in simple Swahili. As a beginner, it is best to stick with Tishio ni kubwa.