busy 用法 Why are you so busy ? You are so busy. 主 系 副 表 (adj.) Busy adj. 忙碌的adv. busily 忙碌地 Be busy with sth 忙于某事 She is busy with her test. Be busy (in) doing sth. 难点和易错点 In+宾语 (动词-动名词) She is busy helping her mother with housework. Spend 钱 时间 (in) doing sth. She spends one hour helping her mother with housework.