Unit2 How often do you exercise?【重点语法】(初中英语微信公众号:ID:chuzhong-yingyu)1. 频率副词: always, usually, often, sometimes, never频率副词在句中通常放在实义动词之前, be动词或助动词之后。常用于一般现在时态中。2.“次数”的表达方法一次 once, 两次twice,三次或三次以上:基数词+ times, 如:three times, five times,3. how often“多久一次”问频率,回答常含有频率词组或短语。常见的how疑问词:1)How soon 多久(以后)How soon will he be back?他多久能回来?He will be back in a month. 他一个月后能回来。2)how long “多久”How long did it take you to clean the house? 你打扫房子用了多久?It took me half an hour to clean the