This Research provides an inner picture of Language acquisition at Core Syntactic level. An extensive amount of work has been consulted while writing this research. An experimental study determines the acquisition of English language by the speakers of two, syntactically un-identical, languages. The transfer of the grammatical elements from their native language at end-state (near native competence) indicates that the Native language plays a critical role while acquiring second language and its effect, no-matter trivial, exists.