第九单元的知识点

bdqnwqk2年前基础11

1.初三化学第九单元知识点归纳

认真看看吧,会有用的,我现在在上初三的化学家教,这是我自己总结的部分加上收集别人总结的精华。

希望对你有帮助。第九单元 《溶液》知识点总结 一、溶液的形成1、溶液 (1)溶液的概念:一种或几种物质分散到另一种物质里形成的均一的、稳定的混合物,叫做溶液 (2)溶液的基本特征:均一性、稳定性的混合物 注意:a、溶液不一定无色,如CuSO4为蓝色 FeSO4为浅绿色 Fe2(SO4)3为黄色 b、溶质可以是固体、液体或气体;水是最常用的溶剂 c、溶液的质量 = 溶质的质量 + 溶剂的质量 溶液的体积 ≠ 溶质的体积 + 溶剂的体积 d、溶液的名称:溶质的溶剂溶液(如:碘酒——碘的酒精溶液) 固体、气体溶于液体,液体为溶剂2、溶质和溶剂的判断 有水,水为溶剂,液体溶于液体 无水,量多的为溶剂3、饱和溶液、不饱和溶液 (1)概念: (2)判断方法:看有无不溶物或继续加入该溶质,看能否溶解 (3)饱和溶液和不饱和溶液之间的转化 注:①Ca(OH)2和气体等除外,它的溶解度随温度升高而降低 ②最可靠的方法是:加溶质、蒸发溶剂 (4)浓、稀溶液与饱和不饱和溶液之间的关系 ①饱和溶液不一定是浓溶液 ②不饱和溶液不一定是稀溶液,如饱和的石灰水溶液就是稀溶液 ③在一定温度时,同一种溶质的饱和溶液一定要比它的不饱和溶液浓 (5)溶解时放热、吸热现象 溶解吸热:如NH4NO3溶解 溶解放热:如NaOH溶解、浓H2SO4溶解 溶解没有明显热现象:如NaCl 二、溶解度1、固体的溶解度 (1)溶解度定义:在一定温度下,某固态物质在100g溶剂里达到饱和状态时所溶解的质量 四要素:①条件:一定温度②标准:100g溶剂③状态:达到饱和④质量:单位:克 (2)溶解度的含义: 20℃时NaCl的溶液度为36g含义:在20℃时,在100克水中最多能溶解36克NaCl 或在20℃时,NaCl在100克水中达到饱和状态时所溶解的质量为36克 (3)影响固体溶解度的因素:①溶质、溶剂的性质(种类) ②温度 大多数固体物的溶解度随温度升高而升高;如KNO3 少数固体物质的溶解度受温度的影响很小;如NaCl 极少数物质溶解度随温度升高而降低。

如Ca(OH)2 (4)溶解度曲线 例: (1)t3℃时A的溶解度为 80g (2)P点的的含义 在该温度时,A和C的溶解度相同 (3)N点为 t3℃时A的不饱和溶液 ,可通过 加入A物质,降温, 蒸发溶剂 的方法使它变为饱和 (4)t1℃时A、B、C、溶解度由大到小的顺序C>B>A (5)从A溶液中获取A晶体可用降温结晶 的方法获取晶体。 (6)从A溶解度是 80g 。

(7)t2℃ 时A、B、C的饱和溶液各W克,降温到t1℃ 会析出晶体的有A和B 无晶体析出的有 C ,所得溶液中溶质的质量分数由小到大依次为 A(8)除去A中的泥沙用 过滤 法;分离A与B(含量少)的混合物,用 结晶 法2、气体的溶解度 (1)气体溶解度的定义:在压强为101kPa和一定温度时,气体溶解在1体积水里达到饱和状态时的气体体积。 (2)影响因素: ①气体的性质 ②温度(温度越高,气体溶解度越小) ③压强(压强越大,气体溶解度越大)3、混合物的分离 (1)过滤法:分离可溶物 + 难溶物 (2)结晶法:分离几种可溶性物质 结晶的两种方法 蒸发溶剂,如NaCl(海水晒盐) 降低温度(冷却热的饱和溶液,如KNO3) 三、溶质的质量分数1、公式: 溶质质量分数= * 100%2、在饱和溶液中: 溶质质量分数C%= * 100%(C 3、配制一定溶质质量分数的溶液 (1)用固体配制:①步骤:计算、称量、溶解 ②仪器:天平、药匙、量筒、滴管、烧杯、玻璃棒 (2)用浓溶液稀释(稀释前后,溶质的质量不变) ①步骤:计算、量取、稀释 ②仪器:量筒、滴管、烧杯、玻璃棒。

2.化学九年级第九单元知识点

第九单元 溶液 参考下把,最好把邮箱给我,给你发更全面的.一、溶液的形成1、溶液的基本特征:均一性、稳定性的混合物 注意:a、溶液不一定无色,如CuSO4为蓝色 b、溶质可以是固体、液体或气体;水是最常用的溶剂c、溶液的质量 = 溶质的质量 + 溶剂的质量;溶液的体积 ≠ 溶质的体积 + 溶剂的体积2、溶质和溶剂判断 :在溶液中只有一种溶剂,有水为溶剂,无水量多液体为溶剂;其余所有物质为溶质3、饱和溶液、不饱和溶液 (1)判断方法:看有无不溶物或继续加入该溶质,看能否溶解(2)饱和溶液和不饱和溶液之间的转化①加水②升温饱和溶液 不饱和溶液 ①增加溶质②降温③蒸发溶剂 饱和石灰水变成不饱和的石灰水的方法是:①加水②降温注:①Ca(OH)2它的溶解度随温度升高而降低②最可靠的转化方法是:加溶质、蒸发溶剂(5)溶解时放热、吸热现象溶解吸热:如NH4NO3溶解;放热:如NaOH溶解、浓H2SO4溶解;溶解没有明显热现象:如NaCl二、溶解度1、固体的溶解度(1)溶解度定义:四要素:①条件:一定温度②标准:100g溶剂③状态:达到饱和④质量:单位:克(2)溶解度的含义:20℃时NaCl的溶解度为36g含义:在20℃时,在100克水中最多能溶解36克NaCl或在20℃时,NaCl在100克水中达到饱和状态时所溶解的质量为36克(3)影响固体溶解度的因素:①溶质、溶剂的性质(种类)内因 ②温度 外因大多数固体物的溶解度随温度升高而升高;如KNO3少数固体物质的溶解度受温度的影响很小;如NaCl极少数物质溶解度随温度升高而降低.如Ca(OH)2(4)溶解度曲线例:(1)t3℃时A的溶解度为 80g .(2)P点的的含义 在该温度时,A和C的溶解度相同(3)N点为 t3℃时A的不饱和溶液 ,可通过 加入A物质,降温,蒸发溶剂 的方法使它变为饱和(4)t1℃时A、B、C、溶解度由大到小的顺序C>B>A(5)从A溶液中获取A晶体可用降温结晶 的方法获取晶体.(6)t2℃ 时A、B、C的饱和溶液各W克,降温到t1℃会析出晶体的有A和B 无晶体析出的有 C ,所得溶液中溶质的质量分数由小到大依次为 A。

3.初二下英语(人教版)第9单元的知识要点

Unit 9 Have you ever been to an amusement park?1. take a ride 兜风2. take the subway3. have been to, have gone to4. on the one hand, on the other hand5. a good place to practice your English6. outside of China7. end up 结束8. take a holiday/vacation 度假9. all year round 全年10. such as 例如 11. a zoo called/named… 一个叫做……的动物园12. during the daytime 在白天13. wake up 醒来14. wake somebody up 唤醒/叫醒某人15. have a great/nice/wonderful/great time 玩得高兴16. a wonderful place to take a holiday/to visit 一个度假/游览的好地方17. an English-speaking country 一个讲英语的国家18. be asleep=fall asleep 睡着19. go on a DISNEY cruise20. travel to another province of China21. the reasons for learning English22. an exchange student23. improve my listening skills24. one….,the other..25. Three quarters of the population are Chinese. 四分之三的人口是中国人(谓语动词用复数形式)26. What's the population of China? 中国的人口是多少?(不用how much提问) 27. the population of China is 1.3 billion 中国的人口是13亿。

(谓动词用单形式) 本单元目标句型:1. Me neither.2.It's fun to learn another language.3.Disneyland is an amusement park, but we can also call it a theme park.4.It has all the normal attractions you can find at an amusement park, but it also has a theme.5.the roller coaster is themed with Disney characters.6.You can see Disney characters walking around Disneyland all the time.7.These are huge boats that also have the Disney theme. You can take a ride on the boat for several days, and you sleep and eat on board.8.There are also many attractions on board just like any other Disneyland.9.The boat rides all take different routes, but they all end up in the same place.10.It is just so much fun in Disneyland.11.Here's what two of our students said about our school.12.When I was a young girl, all I ever wanted to do was traveling, and I decided that the best way to do this was to become a flight attendant .13.I discovered that the most important requirement was to speak English well, so I studied English at the Hilltop Language School for five years before I became a flight attendant.14.It was because I could speak English that I got the job.15.It's all I have ever wanted to be.16.However, I know that I have to improve my English, so I have started taking lessons at the school.17.Maybe when I leave school I'll think about becoming an English teacher rather than a tour guide.18.What other job is he thinking of doing?19.You can rent bicycles at the amusement park.20.For many Chinese tourists, this small island in Southeast Asia is a wonderful place to take a holiday.21.Maybe you fear that you won't be able to find anything to eat in a foreign country.22.However, if you 're feeling brave, Singapore is an excellent place to try new food.23.If you go to see lions, tigers, or foxes during the daytime, they'll probably a asleep.24.One great thing about Singapore is that the temperature is almost the same all year round..this is because the island is so close to the equator. So you can choose to go whenever you like—spring, summer, or winter.现在完成时句型举例:1.Have you ever been to an amusement park? 你曾经去过游乐园吗?Yes, I have./ No, I haven't. 2.I have never been there. Me neither=Neither have I. 我也没有.3.Where is he? He has gone to the Beijing.4.How long has he been in Beijing? (不能用come/arrive)5.I've never been to an aquarium. 我从没去过水族馆.6.I have been a student here for a year. 我成为这的学生有一年了. (不能用become) =I became a student here a year ago.7.He has been dead for two years.(不能用die)=he died two years ago.8.I have been a teacher since ten years ago(for ten years.) (不能用become)9.I have just/ever/already/never seen the movie. Have you ever heard of the man before?本单元语法讲解 现在完成时1.现在完成时态表示过去发生的动作对现在造成的影响或结果。本时态标志词:already (“已经”,用于肯定句中,放在have /has之后或句尾); yet (“仍然”“还”,用于疑问句或否定句的句尾) just(“刚刚”,放在have /has之后); before(“以前”,放在句尾);ever(“曾经”,放在have /has之后) never (“从没有”,在have /has之后) 例句:1.Our teacher has just left. 2.We have studied English already.3.I have not finished the homework yet. 4.He has never been to Beijing before.2.某个动作从过去已经开始,一直持续到现在,还有可能持续到将来.动作的持续性要通过一段时间来表示一段时间的表达方法有两种:for: +一段时间 for a year for two weeks for three years Since +过去的某一时刻, 。

4.初二下英语(人教版)第9单元的知识要点

Unit 9 Have you ever been to an amusement park?1. take a ride 兜风2. take the subway3. have been to, have gone to4. on the one hand, on the other hand5. a good place to practice your English6. outside of China7. end up 结束8. take a holiday/vacation 度假9. all year round 全年10. such as 例如 11. a zoo called/named… 一个叫做……的动物园12. during the daytime 在白天13. wake up 醒来14. wake somebody up 唤醒/叫醒某人15. have a great/nice/wonderful/great time 玩得高兴16. a wonderful place to take a holiday/to visit 一个度假/游览的好地方17. an English-speaking country 一个讲英语的国家18. be asleep=fall asleep 睡着19. go on a DISNEY cruise20. travel to another province of China21. the reasons for learning English22. an exchange student23. improve my listening skills24. one….,the other..25. Three quarters of the population are Chinese. 四分之三的人口是中国人(谓语动词用复数形式)26. What's the population of China? 中国的人口是多少?(不用how much提问) 27. the population of China is 1.3 billion 中国的人口是13亿。

(谓动词用单形式)本单元目标句型:1. Me neither.2.It's fun to learn another language.3.Disneyland is an amusement park, but we can also call it a theme park.4.It has all the normal attractions you can find at an amusement park, but it also has a theme.5.the roller coaster is themed with Disney characters.6.You can see Disney characters walking around Disneyland all the time.7.These are huge boats that also have the Disney theme. You can take a ride on the boat for several days, and you sleep and eat on board.8.There are also many attractions on board just like any other Disneyland.9.The boat rides all take different routes, but they all end up in the same place.10.It is just so much fun in Disneyland.11.Here's what two of our students said about our school.12.When I was a young girl, all I ever wanted to do was traveling, and I decided that the best way to do this was to become a flight attendant .13.I discovered that the most important requirement was to speak English well, so I studied English at the Hilltop Language School for five years before I became a flight attendant.14.It was because I could speak English that I got the job.15.It's all I have ever wanted to be.16.However, I know that I have to improve my English, so I have started taking lessons at the school.17.Maybe when I leave school I'll think about becoming an English teacher rather than a tour guide.18.What other job is he thinking of doing?19.You can rent bicycles at the amusement park.20.For many Chinese tourists, this small island in Southeast Asia is a wonderful place to take a holiday.21.Maybe you fear that you won't be able to find anything to eat in a foreign country.22.However, if you 're feeling brave, Singapore is an excellent place to try new food.23.If you go to see lions, tigers, or foxes during the daytime, they'll probably a asleep.24.One great thing about Singapore is that the temperature is almost the same all year round..this is because the island is so close to the equator. So you can choose to go whenever you like—spring, summer, or winter.现在完成时句型举例:1.Have you ever been to an amusement park? 你曾经去过游乐园吗?Yes, I have./ No, I haven't. 2.I have never been there. Me neither=Neither have I. 我也没有.3.Where is he? He has gone to the Beijing.4.How long has he been in Beijing? (不能用come/arrive)5.I've never been to an aquarium. 我从没去过水族馆.6.I have been a student here for a year. 我成为这的学生有一年了. (不能用become) =I became a student here a year ago.7.He has been dead for two years.(不能用die)=he died two years ago.8.I have been a teacher since ten years ago(for ten years.) (不能用become)9.I have just/ever/already/never seen the movie. Have you ever heard of the man before?本单元语法讲解现在完成时1.现在完成时态表示过去发生的动作对现在造成的影响或结果。本时态标志词:already (“已经”,用于肯定句中,放在have /has之后或句尾); yet (“仍然”“还”,用于疑问句或否定句的句尾) just(“刚刚”,放在have /has之后); before(“以前”,放在句尾);ever(“曾经”,放在have /has之后) never (“从没有”,在have /has之后)例句:1.Our teacher has just left. 2.We have studied English already.3.I have not finished the homework yet. 4.He has never been to Beijing before.2.某个动作从过去已经开始,一直持续到现在,还有可能持续到将来.动作的持续性要通过一段时间来表示一段时间的表达方法有两种:for: +一段时间 for a year for two weeks for three yearsSince +。

5.数学九年级上册知识点归纳总结

1二次根式:形如式子为二次根式; 性质:是一个非负数; 2二次根式的乘除: 3二次根式的加减:二次根式加减时,先将二次根式华为最简二次根式,再将被开方数相同的二次根式进行合并。

4海伦-秦九韶公式: ,S是三角形的面积,p为 。 1一元二次方程:等号两边都是整式,且只有一个未知数,未知数的最高次是2的方程。

2一元二次方程的解法 配方法:将方程的一边配成完全平方式,然后两边开方; 因式分解法:左边是两个因式的乘积,右边为零。 3一元二次方程在实际问题中的应用 4韦达定理:设是方程的两个根,那么有 1:一个图形绕某一点转动一个角度的图形变换 性质:对应点到旋转中心的距离相等; 对应点与旋转中心所连的线段的夹角等于旋转角 旋转前后的图形全等。

2中心对称:一个图形绕一个点旋转180度,和另一个图形重合,则两个图形关于这个点中心对称; 中心对称图形:一个图形绕某一点旋转180度后得到的图形能够和原来的图形重合,则说这个图形是中心对称图形; 3关于原点对称的点的坐标 1圆、圆心、半径、直径、圆弧、弦、半圆的定义 2垂直于弦的直径 圆是轴对称图形,任何一条直径所在的直线都是它的对称轴; 垂直于弦的直径平分弦,并且平方弦所对的两条弧; 平分弦的直径垂直弦,并且平分弦所对的两条弧。 3弧、弦、圆心角 在同圆或等圆中,相等的圆心角所对的弧相等,所对的弦也相等。

4圆周角 在同圆或等圆中,同弧或等弧所对的圆周角相等,都等于这条弧所对的圆心角的一半; 半圆(或直径)所对的圆周角是直角,90度的圆周角所对的弦是直径。 5点和圆的位置关系 点在圆外d>r 点在圆上d=r 点在圆内d

6直线和圆的位置关系 相交dr 切线的性质定理:圆的切线垂直于过切点的半径; 切线的判定定理:经过圆的外端并且垂直于这条半径的直线是圆的切线; 切线长定理:从圆外一点引圆的两条切线,它们的切线长相等,这一点和圆心的连线平分两条切线的夹角。 三角形的内切圆:和三角形各边都相切的圆为它的内切圆,圆心是三角形的三条角平分线的交点,为三角形的内心。

7圆和圆的位置关系 外离d>R+r 外切d=R+r 相交R-r0,开口向上;a<0,开口向下; 对称轴: ; 顶点坐标: ; 图像的平移可以参照顶点的平移。

2用函数观点看一元二次方程 3二次函数与实际问题 1图形的相似 相似多边形的对应边的比值相等,对应角相等; 两个多边形的对应角相等,对应边的比值也相等,那么这两个多边形相似; 相似比:相似多边形对应边的比值。 2相似三角形 判定: 平行于三角形一边的直线和其它两边相交,所构成的三角形和原三角形相似; 如果两个三角形的两组对应边的比相等,并且相应的夹角相等,那么两个三角形相似; 如果一个三角形的两个角与另一个三角形的两个角对应相等,那么两个三角形相似。

3相似三角形的周长和面积 相似三角形(多边形)的周长的比等于相似比; 相似三角形(多边形)的面积的比等于相似比的平方。 4位似 位似图形:两个多边形相似,而且对应顶点的连线相交于一点,对应边互相平行,这样的两个图形叫位似图形,相交的点叫位似中心。

1锐角三角函数:正弦、余弦、正切; 2解直角三角形 1投影:平行投影、中心投影、正投影 2三视图:俯视图、主视图、左视图。 3三视图的画法 1本单元教学的主要内容. 一元二次方程概念;解一元二次方程的方法;一元二次方程应用题. 2本单元在教材中的地位与作用. 一元二次方程是在学习《一元一次方程》、《二元一次方程》、分式方程等基础之上学习的,它也是一种数学建模的方法.学好一元二次方程是学好二次函数不可或缺的,是学好高中数学的奠基工程.应该说,一元二次方程是本书的重点内容. 了解一元二次方程及有关概念;掌握通过配方法、公式法、因式分解法降次──解一元二次方程;掌握依据实际问题建立一元二次方程的数学模型的方法;应用熟练掌握以上知识解决问题. 通过丰富的实例,让学生合作探讨,老师点评分析,建立数学模型.根据数学模型恰如其分地给出一元二次方程的概念.结合八册上整式中的有关概念介绍一元二次方程的派生概念,如二次项等.通过掌握缺一次项的一元二次方程的解法──直接开方法,导入用配方法解一元二次方程,又通过大量的练习巩固配方法解一元二次方程.求根公式的条件:b2-4ac>0,b2-4ac=0,b2-4ac<0.通过复习八年级上册《整式》的第5节因式分。

6.化学九年级第九单元知识点

第九单元 溶液 参考下把,最好把邮箱给我,给你发更全面的。

一、溶液的形成1、溶液的基本特征:均一性、稳定性的混合物 注意: a、溶液不一定无色,如CuSO4为蓝色 b、溶质可以是固体、液体或气体;水是最常用的溶剂c、溶液的质量 = 溶质的质量 + 溶剂的质量;溶液的体积 ≠ 溶质的体积 + 溶剂的体积2、溶质和溶剂判断 :在溶液中只有一种溶剂,有水为溶剂,无水量多液体为溶剂;其余所有物质为溶质3、饱和溶液、不饱和溶液 (1)判断方法:看有无不溶物或继续加入该溶质,看能否溶解(2)饱和溶液和不饱和溶液之间的转化 ①加水②升温饱和溶液 不饱和溶液 ①增加溶质②降温③蒸发溶剂 饱和石灰水变成不饱和的石灰水的方法是:①加水②降温注:①Ca(OH)2它的溶解度随温度升高而降低 ②最可靠的转化方法是:加溶质、蒸发溶剂(5)溶解时放热、吸热现象溶解吸热:如NH4NO3溶解;放热:如NaOH溶解、浓H2SO4溶解;溶解没有明显热现象:如NaCl二、溶解度1、固体的溶解度(1)溶解度定义:四要素:①条件:一定温度②标准:100g溶剂③状态:达到饱和④质量:单位:克(2)溶解度的含义: 20℃时NaCl的溶解度为36g含义:在20℃时,在100克水中最多能溶解36克NaCl或在20℃时,NaCl在100克水中达到饱和状态时所溶解的质量为36克(3)影响固体溶解度的因素:①溶质、溶剂的性质(种类)内因 ②温度 外因 大多数固体物的溶解度随温度升高而升高;如KNO3 少数固体物质的溶解度受温度的影响很小;如NaCl 极少数物质溶解度随温度升高而降低。如Ca(OH)2(4)溶解度曲线 例: (1)t3℃时A的溶解度为 80g . (2)P点的的含义 在该温度时,A和C的溶解度相同 (3)N点为 t3℃时A的不饱和溶液 ,可通过 加入A物质,降温, 蒸发溶剂 的方法使它变为饱和 (4)t1℃时A、B、C、溶解度由大到小的顺序C>B>A (5)从A溶液中获取A晶体可用降温结晶 的方法获取晶体。

(6)t2℃ 时A、B、C的饱和溶液各W克,降温到t1℃会析出晶体的有A和B 无晶体析出的有 C ,所得溶液中溶质的质量分数由小到大依次为 A

7.初一下册英语9单元的全部知识内容

初一英语下册第九单元知识点

(Unit 9 How was your weekend?)

1、How was your weekend? 你的周末过得怎样?

“How+一般疑问句”用来询问“某物或某事怎么样?” 因为这里询问的是过去了的事, 所以动词be用的是过去式。

如: How is your sister/study? 你的妹妹/学习怎么样?—— It was great/OK/not very good… 2、What about your friend, Carol? 你的朋友Carol怎么样呢(干了些什么呢)? “What about „? 怎么样?”这个句型用来询问消息、提供建议或征询意见的,也可以用“How about„?”。因为about是介词,其后只能接名词。如果是动词,动词要加上-ing。 如. --What about this film? --It's interesting. 这部影片如何?很有趣。 --How about playing football? --Good idea! 去踢足球如何?好主意!

3、注意:带有be动词的过去时的句子,一定要看清主语再正确选择用was还是were.

am(is) →was are→were

例如:我今年12岁。 我去年11岁。

I am twelve years old this year. I _was eleven years old last year. 他们今天在中国。他们昨天在日本。

They are in China today. They were in Japan yesterday. 4、What did you do last weekend? 你在周末做了些什么?

这是what引导的特殊疑问句。因为是询问发生在过去的事情,所以用一般过去时态。句中的did是助动词do的过去时, 没有实际意义。do是实义动词, 是“做”、“干”的意思。 5、行为动词的一般过去时:

陈述句: 主语+动词过去式+其它 I go to the movie. →I went to the movie.

否定句: 主语+助动词didn't+动词原形+其它 I don't go to school today. →I didn't go to school. 一般疑问句: Did +主语+动词原形+其它 Do you have breakfast?→Did you have breakfast? 6、规则动词过去时的变化规则

(1)一般情况在动词原形后加-ed want-wanted (2) 以字母e 结尾的动词,只加-d move-moved

(3)以“ 辅音字母+y ”结尾的动词,把y 改为i,再加-ed carry-carried

(4) 以重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,+-ed stop-stopped 7、动词不规则变化

am, is—was are—were go—went do—did have—had come—came take—took say—said eat—ate see—saw get—got put—put sleep—slept give—gave write—wrote read—read

8.人教版七年级下Unit 9 单元知识点总结

单词 rain v. 下雨 windy adj. 多风的;有风的 cloudy adj. 多云的;乌云密布的 sunny adj. 阳光充足的;晴朗的 snow v. 下雪 how's= how is weather n. 天气 Moscow 莫斯科(俄罗斯首都) 俄罗斯首都) Toronto 多伦多(加拿大东南部城市) Boston 波士顿(美国马萨诸塞州州府) How's it going? 情况怎么样? pretty adv. 相当;颇 cold adj. 冷的;寒冷的 cool adj. 凉的;微冷的;凉爽的 warm adj. 暖和的;温暖的 humid adj. 潮湿的;湿润的 CCTV abbr. (China Central Television)中央电视台 Egypt 埃及 vacation n. 假期;休假 take photos 照相 ride v. 乘;骑 camel n. 骆驼 Egyptian adj. 埃及的;埃及人的;埃及语的n. 埃及人;埃及语 scarf n. 围巾;领巾 head n. 头;首;头部 winter n. 冬天;冬季 have a good time 玩得高兴;过得愉快 tower n. 塔;高楼 Eiffel Tower 埃菲尔铁塔 重点句子 How is the weather? 天气怎么样?In the raining. 在下雨。

What are you doing? 你正在做什么?I'm watching TV. 我在看电视。What are they doing? 他们在做什么?They are studying. 他们在学习。

What is he doing? 他在做什么?He is playing basketball . 他在打篮球。What is she doing ? 她在做什么?She is cooking . 她在做饭。

短语 Playing basketball watching TV Having a party riding camels Looking at playing computer games Visiting my grandmother taking phones Wearing a kind of scarf playing the guitar 语法(复习现在进行时) 现在进行时的基本用法:1. 表示说话人说话时刻正在进行的动作或发生事情。汉语中常用"在,正在"来表示。

如:What are you doing ?I am writing a letter to my sister.Look ! They are playing football on the playground.2. 表示现阶段正在进行的动作或持续的状态,这一动作不一定在说话时刻正在进行。It's getting colder and colder.We are working hard to make our country rich and strong.The teacher is writing a new book on math.现在进行时的构成:现在进行时是由is,am,are加上动词的现在分词构成的。

如:They are watching a football match.他们正在看足球比赛。Lily is reading English.莉莉在读英语书。

Those boys are listening to a radio.那些男孩在听收音机。They are having a meeting now.他们现在正在开会。

My father is working in the garden while my mother is sewing my clothes. 现在分词的构成 规 则 原形 现在分词 一般动词在词尾加ing,读[iη] Go try going trying 以不发音字母e结尾的动词,先去掉e,再加ing Come write take coming writing taking 以重读闭音节结尾的动词,如果末尾以一个辅音字母结尾,应先双写这个字母,再加ing,x和w结尾的除外 Get swim slow getting swimming slowing。

第九单元的知识点

标签: 知识点单元