人教版八年级上册第二单元知识点

Unit 2 How often do you exercise? Section A 1. How often do you exercise? how often 对做某事的次数/频率进行提问，常用表示频率的词进行回答，如：always, usually, often, sometimes等。 2. 表示频率的短语 次数+一段时间 “多久一次” 次数为三次及以上：“基数词+times” 如：once a day, twice a week, three times a month... 3. Hi，Clair, are you free next week? sb be free= sb have time 某人有空 Are you free?=Do you have time? sth be free 某物是免费的 The best things in life are free. 生活中最好的东西是免费的。 4. Hmm...next week is quite full for me. be quite full for sb=be quite busy for sb 某人很忙 5. She said it’s good for my health. health (n.) 健康---healthy(adj.) 健康的 unhealthy 不健康的 Be in good health=healthy 身体健康 Grammar focus 6. How often的用法 how often 用来对表示做某事的频率进行提问，回答时可以用表示频率副词或表示频率的短语进行回答。 如： ---How often do you go shopping? （1）---I often go shopping. (频率副词回答) （2）---I go shopping twice a week. (频率短语回答) 2. 频率副词 位置：be之后，动之前。（be动词之后，Shiite动词之前） 频率词及发生概率大小(由大到小): Always, usually, often, sometimes, hardly ever, never(100%--0%) 3.频率短语 位置：句尾 次数+一段时间 如：---How often do you wat