I never learned it either. I have a bunch of vocabulary that I taught myself in 8th grade. So I can mostly understand what’s going on. But that’s it.
Just a few days ago I was trying to get my grandparents to explain to me what “kayn” means as in:
“Kayn mool nisht”
“foorin kayn America”
I thought kayn means “none”, but that doesn’t work in the second one. In that case “kayn” looks like it means “to”. But apparently, even though “tzi” means “to” you can’t say “foorin tzi America”.
Then you have:
gikimmin
tzigikimmin
ungikimmin
oisgikimmin
arangikimmin
idontknowwhatelsegikkimin
I still don’t know which is the correct one:
mir gait arois
gait min arois
mir vellen arois gain
mir vellen aroisgegangen
So I just gave up.