Questions & Answers about Ta stara karoseria nie nadaje się do niczego.
Why do we use do after nadawać się?
The reflexive verb nadawać się means to be suitable or fit for a purpose. It requires the preposition do plus the Genitive case to express what something is suitable for.
The English translation says 'for anything', so why does the Polish sentence use do niczego (for nothing)?
Polish requires double negation. Because the verb is negated with nie (nie nadaje się), the pronoun following it must also be negative. You literally say that the bodywork is not suitable for nothing.
Why is the word for 'nothing' written as niczego instead of nic?
The preposition do always requires the noun or pronoun that follows it to take the Genitive case. Niczego is the Genitive form of the pronoun nic.
Since the English translation uses 'for', could I use the Polish word dla instead of do?
No, you cannot swap them here. While dla means 'for' when something is a benefit or intended for a person, the verb nadawać się strictly pairs with do to describe an object's purpose or suitability.