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1、人教版九年级英语第十三单元知识点总结人教版九年级英语第十三单元知识点总结Unit13。Were trying to save the earth!一 单词litter bottom fisherman coal ugly advantage cost wooden plastic takeaway bin shark fin cruel harmful be harmful to at the top of chain the food chain ecosystem industry law scientific take part in afford turn off reusable p
2、ay for take action transportation recycle napkin throw away put sth to good use pull.。.down upside gate bottle president inspiration iron work metal bring back creativity二1。现在进行时定义：表示说话时（瞬间）正在进行的动作，也表示目前或现阶段一直进行的动作。结构： 肯定句: 主语 + am/is/are + Ving 否定句： 主语 + am/is/are + not + Ving 疑问句： Am/Is/Are + 主语 +
3、 V-ing 用法：1）表示说话时正在进行的，目前正在发生的动作。 Look! The big bird is flying away. He is watching a movie now. 2） 表示目前一段时间内正在进行，但说话时可能没有进行的动作。Right now I am studying Chinese by distance learning. 我现在正通过远程教育学习汉语。1） 2)常带有表示目前时刻的时间副词， 如：now， right now， at the (very) moment, for the time being， at present， these days
4、 及Look！ Listen！ 。.3） 与always， constantly, forever， all the time等副词连用，表示动作反复或习惯。此时句子常含有说话者的强烈情感在内.表达较强的“责备”或“表扬之意 You are always changing your mind。 你总是主意不定。(太烦人了） He is always helping others。他总是帮助别人.(他真是个好人) 4） 对于come， go， leave， arrive， start，fly,drive等表示位置移动的动词常可用进行时态表将来。 He is leaving on Wednesda
5、y. Mary isnt here at the moment. She is coming later。2. used to do见第四单元及use用法3. 被动语态 见第五单元注意：接双宾语的词的被动语态；make /let /have sb do的被动语态;see/ hear /notice /find /observe sb do 的被动语态；Its said/reported/believed/supposed/wellknown；及无被动语态的三种情况（感官动词、不及物动词、sell/write等）4. 现在完成时： 用法：过去发生的动作对现在造成的影响或结果:强调结果Yester
6、day I finished my homework, thats to say， I have finished my homework now。过去已经开始一直持续到现在的动作或状态：强调继续I have lived here since 1990.现在完成时的构成 have/has+过去分词现在完成时的四个基本句型肯定句 He has finished the work。 一般疑问句 Has he finished the work？否定句 He has not finished the work. 两回答 Yes ，he has. No, he hasnt。特殊疑问句 What has
7、 he done？ 在下列情形下用现在完成时1九词语already 已经 肯定句中或句尾 I have already found my pen. = I have found my pen already.yet已经 否定句和疑问句句尾 I have not finished the work yet。Have you bought a computer yet？ever曾经 句中 Have you ever seen pandas？never从不 句中 I have never been to Beijing.just刚刚 句中 I have just done my work.befor
8、e以前 句尾 I have never been there before.so far到目前为止 So far he has learned 200 words。how long多久 How long have you lived here?how many times多少次 How many times has he been to Beijing?2两词组havehasgone to去了某地 例：He has gone to Beijing （去了北京,没回)havebeen to去过某地 例:He has been to Beijing。 （去过北京，回了）3两结构for two mo
9、nths for +一段时间Jim has lived here for 2 months.since last yearsince +过去时间点Lucy has been in Beijing since 3 years ago。since 3 years agosince 1990since he came heresince +过去时态句子He has been in China since he came here.4如果句子里面没有时间状语，汉语意思能够加“已经，往往用现在完成时态。Have you lost your library book? 你已经弄丢了从图书馆借的那本书吗？5
10、现在完成时态还常常用于下列句型They have planted many trees in the last/past few years。 This is the best book I have ever read。 It is the first time I have played the computer games. 在现在完成时中，一次性动词不能和一段时间状语连用例：He has bought the book for 3 years.（错）因buy这个一次性动词不能和一段时间for 3 years连用， 改正的办法有：He has bought the book。. (去掉一
11、段时间for 3 years）He bought the book 3 years ago (改为一般过去时，使句子的意思不变）Its/It has been 3 years since he bought the book. = 3 years has passed since he bought the book。 （改为固定句型 It is/It has been -since-）He has had the book for 3 years. （用延续性动词have代替buy）另外come/arrive/get to/reach be hereI have come here for
12、3 years.（错） 改为：I have been here for 3 years.leave/go be awayHe has left for 3 hours。（错） 改为：He has been away for 3 hours.begin/start be on The film has begun for 3 minutes.（错） 改为：The film has been on for 3 minutes.open be open / close be closedThe shop has opened for 3 years.（错） 改为：The shop has been
13、open for 3 years。die be deadHis father has died for 3 years.（错） 改为:His father has been dead for 3 years。finish/end be overHe has finished the work for 3 days.(错) 改为：The work has been over for 3 daysjoin I have joined the army for 3 years。(错）改为：I have been in the army for 3 years。 或I have been a sold
14、ier for 3 years。buy /catch haveI have bought the bike for 3 years.（错） 改为：I have had the bike for 3 years.He has caught a cold for 3 days.(错） 改为：He has had a cold for 3 days。borrow keepI have borrowed the book for 3 years. （错) 改为:I have kept the book for 3 years。还有其它的归纳如下：break be broken get up be up marry be married become be lose be lost5. 情态动词1) 情态动词本身有一定的词义，表示说话人的情绪、态度或语气，但不能单独作谓语，只能与其他动词构成谓语.常见的有：can (could)， may (might）, must, need， shall (should）， will （would）等。2） 情态动词无人称和数的变化, 后接动词原形.否定式是在情态动词后面加not。个别情态动词有过去式形式， 也可用来表达更加客气、委婉的语气。1.can和could的用法（1)can/could 表示“能力；许可;可能性等
