Bonjour,
a. I don't have a car. ⇒ I wish I had a car.
b. I don't know how to drive. ⇒ I wish I could know how to drive.
c. It's Winter. ⇒ I wish it isn't Winter.
d. I'm ill. ⇒ I wish I couldn't be ill.
e. My laptop is broken. ⇒ I wish my laptop wasn't broken.
f. I have so much homework ! ⇒ I wish I hadn't so much homework.
Voilà ^^ bon(ne) journée/confinement :)