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八年级英语的知识量加大很多，如果不及时进行归纳总结复习，英语成绩也会走下坡路。期末考试临近，小编给大家总结了八年级上册第二单元Unit2所有重难点和必考点，包括重点单词、重点短语、词语辨析，考前收藏背诵吧！  Unit2 How often do you exercise? 【重点语法】 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 house. 我打扫这房子用了半小时。 3）How many+名复 How much+不可名 “多少” 问数量（how much 还可问价格） 【重点短语】 1. go to the movies 去看电影 2. look after = take care of 照顾 3. surf the internet 上网 4. healthy lifestyle 健康的生活方式 5. go skate boarding 去划板 6. keep healthy=stay healthy 保持健康 7. eating habits 饮食习惯 8. take more exercise 做更多的运动 9. the same as 与什么相同 10. be different from 不同 11. once a month一月一次 12. twice a week一周两次 13.make a difference to 对......有影响/作用 14. most of the students=most students 15. shop=go shopping=do some shopping 购物 16. be good for 对......有益 17. be bad for 对......有害 18. come home from school放学回家 19. of course = certainly = sure 当然 20. get good grades 取得好成绩 21. keep/be in good health 保持健康 22. take a vacation 去度假 【词语辨析】 1. maybe / may be maybe 是副词，意为“大概， 可能，或许”，一般用于句首。May be是情态动词，意为“可能是...，也许是...，大概是...”. The baby is crying. Maybe she is hungry. The woman may be a teacher. 2. a few / few / a little / little  People can live to 100, but few people can live to 150. There is little time left. I won’t catch the first bus. Could you give me a little milk? 3. hard / hardly hard作形容词，意为“困难的，艰苦的，硬的”；作副词，意为“努力地，猛烈地”。hardly为副词，意为“几乎不”。 The ground is too hard to dig. I can hardly understand them. It’s raining hard. The people can hardly go outside. 4. As for homework , most students do homework every day . as for...意思是“至于；关于”，+名词、代词或动词的-ing形式（即动名词）。 如： As for him，I never want to see him here. 至于他，我永远不希望在这里见到。 As for the story，you'd better not believe it. 关于那故事，你最好不要相信。 5. That sounds interesting. 这是“主语+系动词+表语”结构的简单句。sound（听起来），look（看起来），smell（闻起来），taste（尝起来），feel（觉得），seem（好象），grow（变得）,get（变得）等词在英语中可用作系动词，后跟形容词作表语。如： It tastes good. 这味道好。 The music sounds very sweet. 这音乐听起来很入耳。 The smoke grew heavier and heavier. 烟雾变得越来越浓了。 6. percent 名词，意为“百分之……” 百分数的表示方法：基数+ percent (不用复数形式)，percent做主语时，谓语动词的数要根据其后面的名词来确定。 50％：fifty percent 百分之五十 Fifty percent of the apples are bad. 50%的苹果都坏了。 Twenty percent of the meat is in the fridge. 20%的肉都在冰箱 7. not… at all 意为“一点也不”，not应放在be动词、情态动词或助动词之后。 The story isn’t interesting at all. 那个故事一点也没有趣。 8. It is + adj. to do sth. 做某事是……的。 It is interesting to play computer games. 玩电脑很有趣。 9. take, spend, pay It takes sb. some time to do sth. 意为“花费某人……时间来做某事”。 人(sb.) spend 时间/钱 on sth. “买某物花了……钱”。 人(sb.) spend 时间/钱 (in) doing“花费多少时间来做某事”。 pay 的主语必须是人，而“花钱买某物”为pay...for... 10. however 副词，意为“然而，可是”，表示转折关系，可放在句首、句中、句末。 (责任编辑：admin) |