Katika sentensi “hiki ni kitabu kizuri,” “kizuri” ni kivumishi na “hiki” ni kiwakilishi.

It means in the sentence.

• katika = in / within
• sentensi = sentence

So Katika sentensi ... introduces an example and means In the sentence ...

These are grammar terms:

• kivumishi = adjective
• kiwakilishi = pronoun

So the sentence is telling you that, in hiki ni kitabu kizuri, the word kizuri functions as an adjective, and hiki functions as a pronoun.

Because it describes the noun kitabu.

In hiki ni kitabu kizuri:

• kitabu = book
• kizuri = good / nice / beautiful (agreeing with kitabu)

So kitabu kizuri means a good book. Since kizuri describes the noun, it is an adjective.

Because it stands on its own rather than directly modifying a noun.

In hiki ni kitabu kizuri, hiki means something like this or this one. It is the subject of the sentence:

• hiki = this / this thing
• ni = is
• kitabu kizuri = a good book

So the whole sentence means This is a good book.

Since hiki is replacing a noun phrase instead of accompanying a noun directly, it is analyzed here as a pronoun.

Because Swahili distinguishes between a form that stands alone and a form that modifies a noun inside a noun phrase.

Compare these:

• Hiki ni kitabu kizuri. = This is a good book.
  Here hiki stands alone, so it works like a pronoun.

• Kitabu hiki ni kizuri. = This book is good.
  Here hiki comes with kitabu, so it is modifying the noun.

English uses this in both jobs, but Swahili grammar often labels the standalone use as a pronoun.

Because of Swahili noun-class agreement.

Kitabu belongs to noun class 7 in the singular, and class 7 commonly uses ki- forms. Words connected to that noun often agree with it:

• kitabu = book
• kizuri = good (class 7 form of -zuri)
• hiki = this (class 7 form)

So the matching ki- is not a coincidence; it shows grammatical agreement.

The adjective stem is -zuri, meaning good, nice, or sometimes beautiful depending on context.

When it agrees with a class 7 noun like kitabu, it becomes:

• ki-
  • -zuri → kizuri

Other noun classes use other agreement forms. For example:

• kitabu kizuri = good book
• vitabu vizuri = good books

Ni is the copula here—the word that works like is / are in sentences that identify or equate things.

So:

• hiki ni kitabu kizuri = this is a good book

In the larger sentence, there is another ni:

• kizuri ni kivumishi = kizuri is an adjective
• hiki ni kiwakilishi = hiki is a pronoun

So ni is being used to say what something is.

Because in Swahili, adjectives usually follow the noun they describe.

So the normal order is:

• kitabu kizuri = good book
• literally: book good

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

No. Hiki is specifically the form of this used with class 7 singular nouns, such as kitabu.

Different noun classes use different forms of this. For example:

• huyu for some class 1 nouns
• hii for some class 9 nouns
• hili for class 5 nouns
• hiki for class 7 nouns

So hiki is not a universal word for this; it depends on the noun class.

The plural of kitabu is vitabu, which belongs to class 8. The agreeing forms change too:

• vitabu = books
• vizuri = good (class 8 form)
• hivi = these (class 8 form)

So:

• Hivi ni vitabu vizuri. = These are good books.

This shows the same agreement pattern as the singular sentence.

Not as a normal complete sentence.

If you want to say this good book, you would usually say:

• kitabu hiki kizuri

That can work as a noun phrase in some contexts, but by itself it is not a full sentence. More commonly, for a full sentence, you would say something like:

• Kitabu hiki ni kizuri. = This book is good.

Or:

• Hiki ni kitabu kizuri. = This is a good book.

So the structure depends on whether you want a noun phrase or a full sentence.

Because the sentence is talking about grammar, not just giving information about a book.

It is a metalinguistic sentence: it discusses words as words.

So when it says that kizuri is an adjective and hiki is a pronoun, it is identifying the grammatical role of those specific forms inside the example sentence hiki ni kitabu kizuri.