Learn Croatian: Vuk je predivlji da bi spavao u kući, mora ostati u kavezu. - The wolf is too wild to sleep in the house, he must stay in the cage.

English uses "too" plus an adjective and an infinitive, but Croatian builds this with the prefix pre- on the adjective, followed by da bi and the l-participle (the active past participle). Literally, this translates as "too wild that he would sleep." This is the standard Croatian structure to express that an excessive quality makes an action impossible.

Can I use previše instead of the prefix pre- and say previše divlji?

While previše divlji is grammatically valid, attaching the prefix pre- directly to the adjective to make predivlji is much more natural and common in Croatian when expressing "too [adjective]". You should generally save the separate word previše for modifying a verb, such as in previše spava (he sleeps too much).

Why do we use the l-participle spavao instead of the infinitive spavati after da bi?

The phrase da bi spavao is a conditional clause. The word bi is the aorist helper verb for the conditional mood, which must always be paired with the l-participle. You cannot use an infinitive after bi. This structure emphasizes that the wolf sleeping in the house is a purely hypothetical idea that will not happen.

Since vuk is a masculine noun, why does the adjective predivlji end in here? Shouldn't predicate adjectives use the short indefinite form?