Jeg har ni bøker.

Breakdown of Jeg har ni bøker.

jeg
I
ha
to have
boken
the book
ni
nine
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Questions & Answers about Jeg har ni bøker.

What does each word in Jeg har ni bøker mean?

jeg = I
har = have (present tense of å ha)
ni = nine
bøker = books (indefinite plural of bok)

How do you form the plural of bok, and why does it change to bøker?
bok is a feminine noun. Its indefinite plural takes the ending -er, and the vowel o undergoes an umlaut (o → ø) to become bøker. This pattern (bok → bøker) is common among Norwegian feminine nouns ending in a single consonant.
Why is there no article before ni bøker (“nine books”)?
Numbers in Norwegian directly modify nouns in the indefinite form, so you never add en/ei/et or noen when you use a numeral. Just like in English you say “five dogs,” in Norwegian you say fem hunder, ni bøker, etc., without a separate article.
Why do we use har here? Isn’t that an auxiliary verb?
In this sentence, har is simply the present-tense form of å ha (“to have”). It’s not an auxiliary here but the main verb meaning “to possess.”
What is the basic word order in Jeg har ni bøker?

This is a standard main clause with Subject–Verb–Object (SVO) order:
Subject (Jeg) + Verb (har) + Object (ni bøker).

How would you turn it into a question: “Do you have nine books?”

Invert the subject and verb, and change jeg to du (“you”):
Har du ni bøker?

How do you say “I don’t have nine books”?

Place ikke (not) after the verb:
Jeg har ikke ni bøker.

Can you drop jeg (the subject) and just say Har ni bøker?
No. Norwegian requires an explicit subject in main clauses (V2 word order). You cannot omit jeg; you need Jeg har ni bøker for a statement, and Har du ni bøker? for a question.
How can you emphasize ni bøker by fronting it in the sentence?

Norwegian allows you to put the object first for emphasis, but then you must keep the verb in second position, so you invert the subject and verb:
Ni bøker har jeg. (Literally: “Nine books have I.”)