人教八年级英语上册第2单元知识点总结归纳

1、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 ba

2、ck? 他多久能回来？he will be back in a month.2 ）how long “多久”他一个月后能回来。how long did it take you to clean the house?it took me half an hour to clean the house.3 ）how many+ 名复how much+ 不可名“多少” 问数量（ how much 还可问价格）你打扫房子用了多久？我打扫这房子用了半小时。【重点短语】1. go to the movies去看电影2. look after = take care of照顾3. surf the inte

3、rnet4. healthy lifestyle上网健康的生活方式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 students15. shop

4、=go shopping=do some shopping购物16. be good for17. be bad for对 . 有益对 . 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 bemaybe 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 .

5、 ”.the baby is crying. maybe she is hungry.the woman may be a teacher.2. a few / few / a little / littlepeople 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 / hardlyhard 作形容词，意为“困难的，艰苦的，硬的”；作副词，意为“努力地， 猛

6、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。

7、as for the story ，youd 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

8、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, payit 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