Questions & Answers about Onko pysäköinti täällä kielletty?
How does the phrase onko... kielletty form a "resultative state"?
Kielletty is the passive past participle of the verb kieltää (to forbid or prohibit). By combining it with the verb olla (here as the question onko), it describes a current state that resulted from a past decision. It literally means "Is it in a prohibited state?"
Could I ask this using a regular passive verb instead, like Kielletäänkö pysäköinti täällä?
You could, but it changes the meaning! Kielletäänkö is an ongoing passive action, so it means "Is parking being prohibited here right now?" (as if someone is currently putting up a new sign). Onko... kielletty correctly asks about the static, existing rule.
Pysäköinti means "parking", but what is the actual verb for "to park"?
The verb is pysäköidä. The word pysäköinti is a noun created from that verb, meaning the act or concept of parking. In this sentence, "parking" acts as the subject, so we must use the noun form.
Just as a refresher, why is the word for "here" täällä and not tänne?
Täällä is the static form of "here", answering the question "where?" (missä?). Tänne means "to here" and is used with verbs of movement (like coming or driving). Since the parking rule simply exists in this location without any motion, we use the static täällä.