人教版八年级英语上册Unit2知识点讲解
How often do you exercise?
Section A Page 9
1. 1. help sb. with sth. 表“在某方面帮助某人”，相当于help sb. (to) do sth. 如：
I often help my mother with housework. = I often help my mother ____ ___ some housework.
2. on weekends = on the weekend在周末，但on weekends 泛指周末，而on the weekend常特
指某个周末。
3. go to the movies = go to the cinema去看电影I often go to the movies on weekends.
4. hardly 与hard 的区别
hardly表“几乎不”，用于否定句中。
而hard有以下几种意思：①困难的②努力地③用来修饰雨或雪下得大
It’s raining _________. I can _______ see the way. It’s very _______ to get to school. I must study _________.
5. exercise 的用法：
当exercise指“操、练习”时，是可数名词，如：do morning exercises 做早操；do eye exercises;
做眼保健操；do English exercises 做英语练习题；但exercise指“锻炼，运动”时，是不可数名词。
如：do some exercise 做运动。
exercise 还可作动词，指“锻炼，运动”如：She exercises every morning.
6. sometimes = at times有时，some times 几次；
sometime（将来的）某个时候；some time 一些时间
① I have visited Beijing _____________.
② ___________ I walk to school.
③ I will visit you ______________.
④ The work is difficult, so I need _____________.
Section A Page 10
1. 本单元围绕“某人多久做一次某事”。
谈论的是一个人现在的行为习惯，所以本单元谈论的话题主
要用_______________ 时态。
2. How often 用来问“多久一次”，回答How often问句常用下列一些频率副词：
Twice a week(一周两次)；always（总是）；usually（常常）；often（经常）；sometimes （有时）；
hardly ever（几乎不）；never（从不）
题：She goes to movies once a week. (对划线部分提问)
_______ _______ _______ she go to movies？
【拓展】
How long ①问“（时间）多久”。
常用“（For）+ 一段时间”来回答②问“（长度）多长”。
How much ①多少（接不可数名词）②多少钱
How soon 问多快（时间），用于将来时态。
常用“In +时间段”来回答。
如：How soon will you come back?你将多快回来？-----In a week.一周后
与how构成的疑问词还有有：①How many 多少（接可数名词复数形式）②How much 多少（接不可数名词）③How old 问年龄④How tall 多高（人、树）⑤How high 多高（山、楼）⑥How far 问距离
(1) is it from your home to your school？------It’s two kilometers away.
(2) is the room？------ It’s two meters long.
(3) will you stay in Beijing ? ---- For a month.
(4) will you finish the work?-----In a month.
(5) do you watch TV ? ---- Four times a week.
(6) How long do you sleep every night? = hours do you sleep every night ?
4. once a week 一周一次，twice a week 一周两次，three/ four times a week 一周3/4次
一次，两次特殊记，三次以后有规律：基数词+times 就可以
5. be free = have time 有空，有时间
Are you free next week ? = _______ you _______ ________ next week ?
6. full 表“满的，忙的”，常见短语有：be full of 装满，充满
My schoolbag is full of books.
【拓展】full还可以表“饱的”，其反义词为hungry（饥饿的）。
如：
Are you hungry ? ---- No, I’m full.
7. How come ? = Why意为“为什么呢”。
8. have / take a dance lesson 上一节舞蹈课（lesson = class课）
I have dance and piano lessons.
9. What kind of 用来问种类______________ dance are you learning? -----Oh, swing dance.
10. How about = What about 表“怎么样，好不好”，可以用来提建议。
about是介词，后接动词ing. How about _________ the movies next week ? ( go )
11. have to 和must
have to强调客观上“不得不”做某事；must指主观上“必须”做某事。
have to有人称和数、时态的变化，而must没有人称或数的变化。
对have to提问和否定用助动词, 而must不需要。
例如：
（1）He has to go there．（人称数的变化）（2）He had to pay for it. (时态的变化)
（3）Must I finish my homework after school ? --- No, you ______ have to.
12.play tennis 打网球。
play 与乐器连用时，乐器前要加the。
球类、棋类前不加the。
题：① Play ______ violin. ② play _____ football. ③ play chess
13. want to do sth. 想去做某事，意思相近的短语有：would like to do sth 和feel like doing sth.
14. swing 名词，秋千：The girl is playing on the swing.
swing ( swung ) 动词，摆动The mother swung her baby.
15. W hat’s your favorite prgram ? = What program do you like best ？你最喜欢的节目是什么？
Section A Page 11
1.（1）maybe意思是“也许、可能”，相当于常位于句首, 后接句子。
（2）may be中，意为“也许是、可能是”, 放句中，后接表语（形容词，名词等）可转换：Maybe you are right. == You may be right.
2. stay up late 熬夜→ stay up late to do sth . 熬夜为了做某事
I stayed up late to watch the soccer game.
3. at least 至少→ at most 最多He plays at least twice a week.
4. busy 表忙的，短语有：be busy doing sth.（正忙于做某事）
Look ! He is busy __________ his mother with housework. ( help )
5. after school 放学后，after class 下课后，in class 在课堂上
Section B page 12
1. want sb. to do sth 想要某人去做某事，类似的短语有：tell/ ask sb. to do sth. 要求某人去做某
事My mother wants me ________ it. ( drink )
2. be good for 对…有好处；be good at 擅长….，be good with 善于和某人相处，善于处理
3. health 名词，健康，短语有：be in good health 处于健康的状态
healthy 形容词，健康的，短语有：keep healthy保持健康
Smoking is bad for your__________, you must keep _________. You can eat ________ food.
4. have a good living habit 有好的生活习惯
5. start with 以…开始Let’s start with the first question.
6. can’t stand (doing ) sth. 无法忍受（做）某事I can’t stand milk.
Section B page 13
1. in one’s free time 在某人空余时间里I usually watch TV in my free time.
2. ask sb. about sth. 向某人询问有关某事物We ask the students about their free time activities. 与ask 有关的短语还有：ask sb. for sth. 向某人要某物；ask sb.(not) to do sth. 要求某人（不）去做
3. (the) use of 表“…的使用”，如：It’s about the use of the Internet.
use还可以作动词，短语有：use sth. to do sth. 用某物去做某事
4. fifteen percent of the students （15%的学生），百分数不用复数，后用of连接要修饰的名词。
作主语时，谓语动词要与of后的名词单复数一致。
Twenty percent of milk _______ ( be ) bad.
5. four to six times a week 每周4至6次
6. 否定句+at all，表“根本不，一点也不”。
如：Some students don’t exercise at all.
7. go online 上网
8. surprise 动词和名词，吃惊；surprised 形容词，感到吃惊的（修饰人）；用法有：
(1) be surprised + that从句：I’m surprised that he got an A.
(2) be surprised at sth. 对…感到吃惊I was surprised at the news.
(3) be surprised to do sth. 做某事很吃惊I was surprised to meet him.
9. the answer to the question 问题的答案；
to 表“针对”如：the key to the lock 锁的钥匙；the ticket to a concert 演唱会的票；
the solution to the problem 问题的解决方法
题：You should give him a ticket a ball game. (A. at C. on D. to )
10. although = though 表“虽然” 不与but连用. （关联词在英语中只要一边）
例_________ it is raining hard, ________ nobody is late for school.
A. because, so
B. So, that
C. although, but
D. although, 不填
11.by = through表“通过做某事”，它们是介词，后可接动名词（动词ing）
It’s good to relax by using the Internet.
12. the best way to do sth. 去做某事的最好方法（不定式作后置定语）
I think the best way to relax is through exercise.
13. such as 和for example 都可以表“例如”，它们的区别有：
⑴ such as 通常放句中，后接几个并列名词。
例：I can speak many languages, English, French and Japanese.
⑵for example 可放句中，句首或句尾，后常接一个句子并与它用逗号隔开。
例：, Australia was unknown
14. spend time with sb. 和某人共度时光
You can spend time with your friends.
15. play together 一起玩（do sth. together 一起做某事：do homework together ）
16. die动词，表“死”，过去式为died。
常见短语有：die of 表“死于”，常用于死于内因（疾病）；die
from 也表“死于”，常用于死于外因（事故，地震）
题：(1) Many people die ______ cancer（癌症）.
(2) Tom’s uncle died ______ a n earthquake（地震）.
Section B page 15
1. a 16-year-old student 用连字符构成了形容词，所以没有复数形式（year不加s）
2. more than 多于→ less than 少于
3. do sth. for some time 做某事持续多久
She always watches TV for more than two hours a day.
4. be afraid to do sth. = be afraid of doing sth. 害怕做某事
I am afraid to speak English in class.= I’m afraid of _______ English in class.
5. go to the dentist 去看牙医
6. magazine 可数名词，复数形式为magazines. 常见短语有：read magazines或read a magazine 读杂志
7. however 然而，常单独使用，后用逗号隔开。
but但是，不能单独使用，后接句子。
Section B page 16
1. none 和no one 的区别：
none与数量有关，可回答how many，表示“一个也没有”；而no one表示“什么人也没有”，可回答who。
① How many people are there in that room?—— . (A. No one B. None )
② Who was late today?—— . (A. No one B. None )
2. through, across，over, 和past都是介词，不能单独做谓语，必须与动词连用才能做谓语。
1）through 从物体内部穿过，如：walk through a forest. 穿过一个森林
2）past 从物体外面绕过, 如：walk past a post office 经过一个邮局
3）across 从物体表面横穿，如：go across the road 横穿马路
4）over 从物体上空越过, 如：fly over the city 飞过城市
【注意】pass（经过），cross (横穿) 都是动词，可作谓语，相当于“动词+pas t/across”.
如：①I pass (walk past) a post office every day. ② Don’t cross (walk across) the road.
题：We didn’t walk the village, we it.
A. cross; past
B. through; pasted
C. through; passed
3. almost 几乎，如：almost every day 几乎每一天。
4. point 可以作可数名词，表“得分”。
如：He scored 10 points in the game.
point还可以作动词，表“指”，短语有：point at 指向；point out 指出，如：
He pointed at me. He pointed out that I was wrong.
5. 感叹句：
⑴How + 形容词/副词(+主语+谓语)! 感叹句中主语和谓语常省去。
如：
①How tall (the tree is)! ②How fast (he runs)!
⑵What + (a / an) + 形容词+ 名词（+主语+ 谓语）! 当名词为可数名词单数时，用a/an, 如：
What a tall tree (it is) ! 当此名词为复数或不可数名词时，不要a/an, 如：
①What tall trees (they are)! ②What bad weather (it is)!
题：_______ beautiful girls they are ! ________ beautiful the girls are !。
