Why do we say things the way we do?

pepper is the pepa and salt is the salt.

 

Nah

 

​

 

I use some of the things I say to keep me positive and to motivate me

 

Does and don'ts instead of donts and does.
Cheese and onion instead of onion and cheese

 

my first thought was "who's we?"

language conventions evolve socially, and that's the beginning and end to it.
in greater depth there's a whole science of the process of how language conventions evolve and the history of their doing so.

i see most people have responded with examples rather then addressing the question as stated.

and that we really depends on where we were each born, grew up and are currently living.

 

WE