Student or Learner
Are the sentences below all correct?
1. My car needs repairing.
2. My car needs repair.
3. My car was damaged beyond repair.
4. My car was damaged beyond repairing.
Is it natural to say "my car was irreparably damaged"?
Yes. In writing, capitalise 'My'.
For the first set, I'd say "My car needs to be repaired."
(I would never say "It needs repairing." That was not part of the dialect where I grew up and it's not part of my dialect now. I realize it is used widely elsewhere.)
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
If it is urgent, I suggest "My car is crying out for repair".
Not a teacher.