The mother tongue is again used in the oral manipulation of grammatical structures, i . e . in bilingual pattern drills.
2.
Examples of researchers on the empiricist side are Jesperson, Palmer, and Leonard Bloomfield, who promote mimicry and memorization with pattern drills.
3.
For them, the theoretical basis, and sufficient justification, of pattern drills is the generative principle, which refers to the human capacity to generate an infinite number of sentences from a finite grammatical competence.