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please kindly help me answer this question
WHAT ARE THE RULES THAT GOVERN THE USE OF GRAMMA IN ENGLISH LANGUAGE?
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At first I thought this was going to be one of these impossible questions that was asking Forum participants to write a whole textbook just to answer one question.

But then I read the question carefully, and it actually can be answered in less than 1000 words.

Use "gramma" as a very informal term meaning "grandma" or "grandmother."

Or use it as a alternative spelling of grama, a type of pasture grass, Bouteloua eriopoda and various species related to it.

Don't mind me kidding you, guest, but you really did ask too much.
Comments  
Actually, there is a pretty concise online English grammar help site at http://www.cs.wcu.edu/res/nasa_sp7084/sp7084cont.html

It's still many pages, but I don't think you could get it much shorter than that.