中高考点易错点busy 用法，be busy in doing ，in常被省略

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.