Unit2 How often do you exercise?一、重点短语 help with housework 帮助做家务 on weekends 在周末 how often 多久一次 hardly ever 几乎从不 once a week 每周一次 twice a month 每月两次 be free 有空 go to the movies 去看电影 use the Internet 用互联网 swing dance 摇摆舞 play tennis 打网球 stay up late 熬夜；睡得很晚 go t
