八年级上册Unit 2 How often do you exercise？知识点总结

八年级上册Unit 2 How often do you exercise?知识点归纳【词汇讲解】1. full【语境激活】Next week is quite full for me.【解析】full是形容词，意为“满的”、“忙的”、“饱的”。

常用短语be full of，意为“充满...”。

如：包里装满了衣服。

The bag is full of clothes.【例句】He could only nod because his mouth was full.He smiled, and his eyes are also full of laughter. 他微笑着，眼睛里也充满了笑意。

2. health【语境激活】She says it's good for my health.【解析】health不可数名词，意为“健康”；healthy是形容词“健康的”，常见搭配keep healthy。

【例题】用所给词的适当形式填空。

A_____( health) body is very important for every one.We take exercise to keep______( health).Smoking is bad for our_______( healthy).3. percent【语境激活】We found that only fifteen percent of our students exercise every day.【解析】意为“百分之...”，为单位词，不能使用复数形式。

“百分数＋of＋名词”作主语，其谓语动词的单复数情况视后面的名词来定。

如果是可数名词复数，谓语动词用复数形式；如果是单数名词或不可数名词，谓语动词用单数形式。

【例句】Twenty percent of the students agree with you.百分之二十的学生赞同你Thirty percent of time passes.百分之三十的时间过去了.【例题】用所给词的适当形式填空。

Eighty percent of English teachers_______(be) women in our school.4. die【语境激活】Old habits die hard.【解析】die是动词，表示“死亡”；其形容词形式是dead，名词是death。

【例句】1.His grandfather died last week.2.She cried out after knowing his husband's death.3.He found a dead bird in the garden.【运用】Group 1 词汇填空1. They had a___________(忙碌的)week in Shanghai last month2. Fruit and vegetables are good for our ___________(健康)3. Ninety ___________(百分之)of the students use the Internet every day.4. The little boy's grandfather ___________(去世)when he was three years old.【短语讲解】1. at least【语境激活】He plays at least twice a week.【解析】at least 意为“至少”，后面常接数词或句子。

【例句】There are at least forty students in the class room.At least, you can read and write.2. such as【语境激活】Exercise such as playing sports is fun.【解析】such as意为“例如，比如说"，后面常接名词；而for example常作为插入语，可以放在句首、句中和句尾。

【例句】He knows many languages,such as Chinese,English,French and German.Many countries speak English, such as Australia and Canada.Members of the club come here for different things. For example, Smith just wants to make more rich friends in the club.Members of the club come here for different things. Smith , for example, just wants to make more rich friends in the club.Members of the club come here for different things. Smith just wants to make more rich friends inthe club, for example.【运用】Group 2 短语填空1. 在我们市每个家庭至少有一台电脑。

Every family has______________________one computer in our city.2. 我喜欢很多蔬菜，例如卷心菜，胡萝卜和西红柿。

I like lots of vegetables, ______________________ cabbages, carrots and tomatoes.【词汇辨析】辨析1：through / across【解析】through介词，意为“穿过”、“通过”，指从物体的内部穿过;across介词，意为“越过；跨过”，指从物体的表面穿过。

across 和through 均可用于从一定范围的一边到另一边的动作。

across的含义与ON有关,表示动作是在某一物体的表面进行。

through 的含义与IN有关,表示动作是在三度空间进行的,四面八方都有东西.比较如下:It took us two hours to walk through the forest.我们花了两个小时才穿过这片森林I walked across the square to the café.I pushed through the crowds to the bar.我穿过人群,来到柜台前.through 不能用于从”细而长”的物体(如河流)之一侧到另一侧的动作.She swam across the river.她游过河去.【例题】选词填空（注意形式）cross,across,through1. We must ________ the road very carefully.2. Before going _________ the road, you should look left first and then right.3. Look! The man is swimming _______ the lake.4. They drove _______ the street quickly, but the police caught them at last.5. The sunlight comes_______ the glass.6. ________ the street and you can get to the hotel.7. He _________ the road and then comes to the post office.8. Walk _______ the footbridge.9. _______ the footbridge.10. The two friends were walking_______ the forest.辨析2：exercise / exercises【解析】exercise作动词或不可数名词时，意为“运动;体育锻炼”；exercise作可数名词时，意为“练习题”、“体操”，常用复数形式exercises。

1.作不及物动词，译为"运动，锻炼"。

如：David exercises every morning.2.作及物动词，译为"训练"。

如：Swimming exercises the whole body.3.作可数名词，译为"体操、练习题"等。

如：It's good to do eye exercises every day.Some old people do morning exercises in the park every day.4.泛指运动时是不可数名词, 常用短语get/take/do exercise.Please do more exercise from now on.Let's get/take/do exercise together.辨析3：maybe / may be【解析】maybe为副词，意为“或许，大概，可能”，通常放在句首;may be是两个词，合在一起构成“情态动词＋动词原形”，放在句中作谓语。

意为“可能是”。

be动词后常接形容词、介词短语或名词等。

【例句】Maybe she'll come this afternoon.Maybe you put the letter in your pockets.I can't find my watch.It may be in your pocket.He may be a soldier.他可能是军人.辨析4：none / no one / nothing【解析】none意为“（三者或三者以上）没有一个”，既可指人，又可指物，常用来回答how many或how much开头的问句。

可与of短语连用，谓语动词用单数形式；no one意为“没有人”，即nobody，常用来回答以who开头的问句；nothing意为“没有东西”，常用来回答以what开头的问句。

【例句】None of us was going to the party.None of them passed the exam.--How many people are there in the room?--房间里有多少人?--None.--一个都没有。