Spelling words with "ei" and "ie"

When the sound is a long \"e\" (as in feed), write \"i\" before \"e\", except after \"c\". After \"c\" reverse the spelling (\"ei\"):

After other letters
believe, yield, reprieve

After c
ceiling, perceive, conceit

The problem with this rule is that it works only when \"ei\"/\"ie\" sounds like the \"ee\" in feet. If it has any other sound, you should write \"ei\" even after letters other than \"c\":
foreign, vein, freight