about semitic morphology

Hi all!

I have a question about the triconsonantal system. Do this languages have an unchanging
form for nouns, or are all different, only the three consonants of an idea must be
unchanged in different words?

An example:

the root for writing is: M G D  for living  D R B
the noun "writing" is   "megid"
That means:
should the noun for "loving" be "derib"???? Or there is no rule that all same function words
must have the same form?

Other:
if nouns, adjectives, etc. are all verbs, how do you form a sentence: "Yes, all six houses are
built to be home of the famous major's friends." :)

        Thanks
                Balazs

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