So 1 and 2 take the singular form, but 3 and up takes the plural?
why is it chàr here and not càr?
oh it's because dà lenites, figured it out!
yes. Aon and Dhà both do that.
Mostly. Aon has a couple of exceptions due to it having an 'n' at the end. d t and s starting words that follow don't lenite.