Ninahitaji stempu moja kwa barua hii.

Because ninahitaji is built from smaller parts:

• ni- = I
• -nahitaji / -hitaji = need

So ninahitaji means I need.

In Swahili, the subject is often built into the verb, so you do not need a separate word for I unless you want extra emphasis.

Yes. In everyday speech, many speakers say nahitaji for I need.

• ninahitaji = more fully spelled-out form
• nahitaji = very common shorter form

Both are understood. A learner may see either one.

Here, stempu means a postage stamp.

It is a loanword, related to English stamp. In this sentence, it refers to the kind of stamp you put on a letter before mailing it.

In Swahili, numbers usually come after the noun.

So:

• stempu moja = one stamp
• barua mbili = two letters

This is different from English, where the number usually comes before the noun.

Moja means one.

So stempu moja means one stamp.

If you say just Ninahitaji stempu kwa barua hii, it would mean I need a stamp for this letter. That is also natural. Adding moja makes it more specific: one stamp.

Here kwa means for.

So:

• kwa barua hii = for this letter

The word kwa has several uses in Swahili, and in other contexts it can mean things like by, with, or at/from someone’s place, but in this sentence the natural meaning is for.

In Swahili, demonstratives like this usually come after the noun.

So:

• barua hii = this letter
• kitabu hiki = this book

That word order is normal in Swahili, even though English puts this before the noun.

Swahili demonstratives must agree with the noun class of the noun they describe.

Barua belongs to the N-class (often called class 9/10), so this becomes hii.

That is why you get:

• barua hii = this letter

If the noun belonged to another class, the form of this would change.

Not usually. Swahili normally does not use articles like English a or the.

So stempu can mean:

• a stamp
• the stamp

The exact meaning depends on context.

That is why Ninahitaji stempu moja kwa barua hii naturally translates as I need one stamp for this letter, even though there is no separate word for a or the.

Here it is singular because the sentence means this letter.

Barua is one of those nouns whose form often stays the same in singular and plural. Context tells you whether it means letter or letters.

For example:

• barua hii = this letter
• barua hizi = these letters

The demonstrative helps show the number.

You could say:

Tunahitaji stempu mbili kwa barua hizi.

That means We need two stamps for these letters.

Changes:

• Ni- → Tu- = I → we
• moja → mbili = one → two
• hii → hizi = this → these

This shows how verbs, numbers, and demonstratives work together.

Hii is pronounced roughly like hee-ee, with both vowels heard.

It is not reduced to one short sound. Swahili pronunciation is usually quite regular, and vowels are normally pronounced clearly.

So the end of the sentence sounds like:

• barua hii
• roughly: bah-roo-ah hee-ee

Yes, absolutely. It is a very natural kind of sentence for a post office or when preparing mail.

You might use it when:

• buying stamps
• checking how many stamps are needed
• explaining what you need to mail a letter

So it is both grammatically useful and practical in real life.