"Do you have a car?"

Translation: Oes gynnoch chi gar?

[catface123]

Is the difference between gennych and gynnoch regional?

[ibisc]

gynnoch chi is the standard form. Variations include gennych chi, ganddoch chi. Stick with gynnoch chi unless you have a particular reason not to.

[Ash473779]

What does "wyt ti'n cael car?" Translate to?

[ibisc]

Most likely: 'Are you getting a car?'

If it was in a sentence such as 'Wyt ti'n cael mynd yno mewn car?' then cael has a sense of being allowed to do something:

• Are you allowed to go there [in a/by] car?

[Steve686400]

What is wrong with the answer "Oes car gyda chi?"

[ibisc]

Nothing, it's fine. It is one of the accepted answers.

[Janet510713]

You have two selections exacrly the same, but only one seems to be correct

[ibisc]

Just checked, and there was a typo in one of the answers - now fixed. Thank you for letting us know.