Don’t look a gift horse in the mouth. American phrase, never got it. Horses don’t bring gifts & if it tried to give you a Christmas present why would looking in its mouth mean you’re not grateful?
ObliviouslyAnd people who don't know the difference between being specific, and the Pacific Ocean. Is state eddukashun reelie that badd?
"You can't have your cake and eat it".
Erm, yes you can, so long as you do it in that order. You can own (have) a cake, and you can also eat that cake, but once you finish eating it you can't go back to the former state of ownership of the said cake.
So I know what youre aiming for dear proverb writer, but a better way to express it is; "You can't eat your cake and yet still have it".
At the end of the day