八年级英语下册第六单元知识点整理一. 重要词汇和句型.1. how long (时间持续)多长 (某物) 多长 -How long did you sleep last night ? - For 8 hours . how soon (从现在起还要)多久 - How soon will he be back ? - In a week .how often (某个动作)隔多久一次 -How often do you go to the cinema ? - Once a month .how far (某地) 多远 - How far is the store from here ? - About 500 meters .how much 多少钱 -How much is the