1. what is 2nd language acquisition(SLA)? -SLA is not uniform at predictable phenomenon -There is no single way in which learners acquire in their L2. -Different learners in different situation learn L2 in different ways. 2 .Difference between 2nd language acquisition and 1st language acquisition SLA is the study of how learners learn additional language after they have acquired their mother tongue. 3. Difference between 2nd language acquisition and Foreign language acquisition -SLA is not intended to contrast with Foreign language acquisition -SLA is used as a general term that embraces Both untutored (Naturalistic) & tutored(classroom) acquisition. 4.Centrality of syntax and morphology -SLA refers to all aspects of language that learners need to master. -It forces on L2 learners acquire grammatical sub-system. - A little is known about L2 phonology , but almost nothing about the acquisition of lexis. 5.Competence VS Performance Competence : -Mental representation of linguistic (input) -Rules which constitues of speaker hearer's (internalized grammar) stored in brain /allow us to process the language. Performance : - Comprehension and production of language (output) -provide evidence for competence for SLA 6.Acquisition VS Learning Acquisition : - picking up 2nd language through exposure -unconscious Learning : Refers to the conscious study of second language.