Unit 9一、短语on Saturday afternoon在周六下午（具体某天的早、中、下午、晚上用介词on） prepare for为做准备= study for. come to the party来参加聚会go to the/a doctor去看医生 have the flu患感冒 help my parents帮助我的父母（help sb do sth/ help out with sth） another time其他时间 last fall去年秋天 go to the party去聚会 hang out常去某处；泡在某处 the day after tomorrow后天 the day before yesterday前天have a piano lesson上钢琴课
