资料预览：

Unit 1: How often do you exercise?

　　【应掌握的句子】

　　1. How often do you exercise? 你（你们）多久锻炼一次身体？

　　How often + 助动词do(does或did) + 主语 + do sth.? 疑问词how often是问频率(多久一次),（在这里助动词do(does或did) 是起帮助构成疑问的作用）与一般现在时或一般过去时连用，回答一般是用表示频率的副词，如：once, twice, three times…, sometimes, often, quite, often, never, every day, once a week , twice a month , three times a month , three or four times a month 等。

　　翻译："你们多久到工厂去一次？""每星期两次。"

　　 ("How often do you go to the factory?" "Twice a week. ")

　　 "他多久去购一次物？""一个月一次。"

　　("How often does he go shopping?" "He goes shopping once a month.")

　　2. "What do you usually do on weekends?" " I usually play soccer."

　　"周末你通常做什么？""我通常踢足球。"

　　第一个do为助动词, 在这起帮助构成疑问的作用；而第二个do则是实义动词。

　　翻译： What do you usually do on weekends? I often go to the movies.                                                               

　　What does she usually do on weekends? She sometimes go hiking.