Some Questions in L2 Theory and Practice

Language is a biological phenomenon primarily

Language is a social phenomenon primarily

There is no such thing as "a language" such as "English"; there are only unique idiolects possessed by individuals

Language is acquired, not learn

Teachers of beginner learners should focus on input (roughly, reading and listening)

An excellent (native-sounding) accent can be aquired by adult learners with enough deliberate study and practice