初二英语上册：Unit 2 重要知识点整理.docx

【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。