Question 1

Why do we use jaka instead of jak here?

Accepted Answer

Jak usually means "how" (as in jak się masz? - how are you?). Jaka is a question word used to ask "what kind of" or "what is it like" about a feminine noun. Because książka (book) is feminine, we use the feminine form jaka instead of the masculine jaki or neuter jakie.

Question 2

I learned that "this is" is to jest. Why does this sentence use ta instead of to?

Accepted Answer

You use to when introducing something generally (like To jest książka - This is a book). But when you point to a specific noun and say "this specific book", the word for "this" must match the noun's gender. Since książka is feminine, "this book" becomes ta książka.

Question 3

Why is the answer just bardzo dobra? Shouldn't it be ona jest bardzo dobra (it is very good)?

Accepted Answer

You can absolutely say ona jest bardzo dobra, but in Polish, it is extremely common to drop the pronoun and the verb in short replies. Because the question just asked about the book, replying with only bardzo dobra (very good) sounds perfectly natural and conversational.

Question 4

How do I know that dobra is the right word for "good" here?

Accepted Answer

Adjectives (describing words) always change their endings to match the gender of the noun they describe. The base dictionary form for "good" is the masculine word dobry. Since książka is a feminine noun, the adjective takes the feminine ending -a to become dobra.

Jaka jest ta książka? — Bardzo dobra.

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