Two manifestations(两个表现) Internal authority:self-adaptation in L1 acquisition learn to model after the adults especially one's parents in language behaviors such as a family or community. External authority:self-adaptation in L2 learning learn to model after the instructors or native speakers in language behaviors in an institutional setting such as a formal class, or school.Two manifestations(两个表现) • Internal authority: self-adaptation in L1 acquisition = learn to model after the adults especially one’s parents in language behaviors such as a family or community. • External authority: self-adaptation in L2 learning = learn to model after the instructors or native speakers in language behaviors in an institutional setting such as a formal class, or school