나 is casual or informal used to the same age(friend), someone younger than you, the children, lover (low formality / low politeness) 저 is formal, polite, and/or humble(겸양어) used to olders, elders, seniors, boss, army, officers, everyone (low Or high formality / high politeness) 나/저 means i/me 저 is more formal or humble than 나
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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