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..???
....
and would u plz explain the EPP, TC, PP..
how could we know if a sentence is violating one of these principles?...
plz plz plz 
|
EPP
EXTERNAL PROJECTION PRENCIPLE
it means that every sentence must have a subject
pp
projection prenciple
ensure that all argument and subcategorization are lexically presented
TC
THETA certaition
each theta role must assigned to one argumemt
each argument must assigned by one theta role
good luck