Learn Polish: Moja żona przygotuje kolację. - My wife will prepare dinner.

Przygotuje is a perfective verb, which means it describes an action that will be fully completed. In Polish, when you add present-tense endings to a perfective verb stem, it automatically creates the future tense. You never use będzie (will be) with perfective verbs!

How do we get the form przygotuje from its basic dictionary form?

The dictionary form is przygotować. Verbs that end in -ować drop that ending and replace it with -uj- before adding the person ending. Since moja żona is "she" (third-person singular), we add the -e ending. This gives us przygotuje.

Why does the word for dinner end in -ę (kolację) here?

The basic dictionary word is kolacja. Because the dinner is the direct object of the sentence (it is the thing being prepared), it must take the accusative case. For feminine nouns ending in -a, the ending changes to -ę in this case.

Why is the word for "my" moja instead of mój?

Words like "my" have to match the gender of the noun they describe. Żona (wife) is a feminine noun, so we must use the feminine form moja. Mój is used for masculine nouns.