【Individual differences】 include language apititude, motivation, learning strategies, age of acquisition.
【language apititude】includes four types:
①phonemic coding ability,
③inductive learning ability,
④rote learning ability.
【motivation】includes four types:
【learning strategies】include four types: ①cognitive strategies,
④ social strategies.
【age of acquisition 】：CPH（critical period hypothesis ）--language learning will be incomplete and difficult after puberty.