Ez a mondat helyes így: "If you would not wait until the next month, feel free to buy it on the internet. "?

Mit szeretne ez pontosan mondani?

Ha azt, hogy "ha nem szeretnél várni a következő hónapig, vedd meg az interneten", akkor

If you wouldn't want to wait until next month, feel free to buy it on the internet (vagy buy it online).

Semmi gond, hogy az iffes felében van a would is.

And if you would not stay silent if the criminal was A MAN WHO BASHED AND RAPED A WOMAN

if you would not pay out money to a disgruntled employee, fight the case,

if you would not have even a crap to eat, you'd change your mind.

if you would not just pick up a random post from somewhere and comment on it

PS: Különben nem csak az a 3 fajta feltételes mondat van, amit tanítanak. Csak azok a leggyakoribbak.

Igazából ezt értem teljesen:

if you would not have even a crap to eat, you'd change your mind.