Read a short article about one office worker's smartphone use and what makes screen time "too much."
Understand the main points of the article, and tell when -(으)ㄹ걸요 is a guess and -(으)ㄹ걸 그랬어요 is a regret.
下载功能面向已登录的学习者 —— 注册只需一分钟,而且免费。
该资料可能已被删除,或链接有误。