八年級下 unit7 grammar4a-4c

Unit 7 Whats the highest mountain in the world? Period 3 Section A (Grammar focus 4c)Step 1 Review:Can you translate the following sentences?長江大約長6,300千米。The Yangtze River is about 6,300 kilometers long.黃河長5,464千米。The Yellow River is 5,464 kilometers long.明朝的長城大約有8,850千米長。The Great Wall in Ming dynasty is about 8,850 kilometers long.21教育網(wǎng)珠穆朗瑪峰高8,844.43米，所以攀登起來很危險(xiǎn)。Qomolangma is 8,844.43 meters high and so is very dangerous to Step 2 Grammar focus Whats the highest mountain in the world? Qomolangma. How high is Qomolangma? Its 8,844.43 meters high. Its higher than any other mountain.21世紀(jì)教育網(wǎng)版權(quán)所有 Which is the deepest salt lake in the world? The Caspian Sea is the deepest of all the salt lakes.21cnjycom Did you know that China is one of the oldest countries in the world?21世紀(jì)*教育網(wǎng) Yes, I did. Its much older than the US. Step 3 Grammar形容詞和副詞比較級和最高級變化規(guī)則1. 規(guī)則變化 1) 一般情況下，單音節(jié)或雙音節(jié)的形容詞（或副詞）比較級er ， 最高級est 如： clevercleverercleverest www-2-1-cnjy-comfewfewerfewest smallsmallersmallest等。 2) 以e結(jié)尾的詞，比較級r，最高級st 即可。 如：nicenicernicest cutecutercutest largelargerlargest 3) 以輔音字母y結(jié)尾的變y為ier或est。如: easyeasiereasiest happyhappierhappiest 再如：early, busy, heavy, dirty, lazy也如此。 少數(shù)單音節(jié)詞也是這樣，如： pleasedmore pleasedthe most pleased 2-1-c-n-j-ytiredmore tiredthe most tired 2. 不規(guī)則變化： good better best well better best 21*cnjy*combadworse worst many / much more most far farther farthest (距離遠(yuǎn)) far further furthest (程度深) old elder eldest (長幼) old older oldest (年齡)Step 4 中考鏈接1. 比較級考點(diǎn) 比較級修飾問題a little, a bit, even, still, much, a lot, far 等可修飾比較級。【來源：21cnj*y.co*m】e.g. Tom is a little taller than Jim. This book is much more interesting than that one.【出處：21教育名師】 同級比較e.g. The weather in Beijing is colder than that in Xian. Our school is bigger than yours.21教育名師原創(chuàng)作品 the + 比較級e.g. Lucy is the fatter of the two girls. “a/an + 比較級”表示“又一，再一”e.g. Lily has a doll, but she wantsa bigger one. 隱性比較（沒有than的情況）e.g. Who runs faster, Lucy or Lily? Youd better come earlier next time. He worked hard last term, but he works even harder this 越來越.a. 比較級 + and + 比較級b. the + 比較級 + 句子，the + 比較級 + 句子a. e.g. Its getting colder and colder. The more you exercise, the better you are. 21*cnjy*com2. 最高級考點(diǎn)說明：形容詞的最高級前必須加the; 副詞的最高級前省略the。 范圍問題e.g. Tom is the tallest student in the class. Spring is the best season of the year.【版權(quán)所有：21教育】 “.之一”問題e.g. Beijing is one of the biggest cities in the world.【來源：21世紀(jì)教育網(wǎng)】 “the + 序數(shù)詞 + 最高級”e.g. I think he is the second tallest boy in his class.3. 比較級和最高級的轉(zhuǎn)換e.g. Tom is the tallest student in the class. = Tom is taller than any other student in the class. = Tom is taller than all the other students in the class. = No other students are taller than Tom.21cnjy2. 同級比較 as + adj./adv. + as e.g. She is as thin as Lily. He writes as carefully as Linda. not + as/so + adj./adv. + as e.g. Tony didnt run so fast as Carter Step 5 Writing Write five questions using comparisons. Then ask your partner your questionsStep 6 Work on 4a /4b 1.Get the students to fill in the blandks with the correct forms of the words in the box.2. Get the students to write two comparisons about two topics.Step 7 Work on 4cGet the students to write five questions using comparisons.Then ask his/her partner your questions.Step 8 Exercises: