hey moayad..
 thx but i need more plz..
and what if it's come in ungrammatical sentence...!!
eg: *the PRO cat sat ti on the mat ti pro.
why is it ungrammatical..???
because there are two noun phrases
the PRO is noun phrase
cat is also noun phrase
pronouns always come instead of noun phrase not with it
....
and would u plz explain the EPP, TC, PP..
how could we know if a sentence is violating one of these prenciples?...
plz plz plz 
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PP prepositional phrase
EPP, TC I
I don't know what do they mean, but make sure of the spelling