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    1. 初三英語(yǔ)第十八單元Planting trees 植樹(shù)

      發(fā)布時(shí)間:2017-11-17 編輯:互聯(lián)網(wǎng) 手機(jī)版

      內(nèi)容

      一、教法建議

      【 拋磚引玉 】

      單元雙基學(xué)習(xí)目標(biāo)

      Ⅰ. 詞匯學(xué)習(xí)

      plant , wonderful , dig , deep , stick , tie , diagram , forest , copy , million , towards , mountain , harvest

      neither…nor , knock…into… , next to , so that , cut down , millions of , stop…from doing sth , blow…away , not only…but also… , in a few years' time , far away , thanks to

      Ⅱ. 句型學(xué)習(xí)

      Tie the tree to the top of the stick to keep it straight .

      The more , the better .

      The river near here is over four metres deep .

      The Great Green Wall is between 400 and 1 700 kilometres wide .

      Trees must be watered well .

      The earth should be pushed down hard .

      More or less !

      While you're doing that I'll go and get some water .

      Ⅲ.語(yǔ)法學(xué)習(xí)

      1 ) 含有情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)的構(gòu)成及用法。

      2 ) 計(jì)量的表達(dá)。

      Ⅳ. 交際英語(yǔ)

      如何讓別人做某事。

      【 指點(diǎn)迷律 】

      單元重點(diǎn)詞匯點(diǎn)撥

      1 . plant 1 ) 種植 ( 動(dòng)詞 ) 2 ) 植物 ( 名詞 )

      We planted some roses in the garden .

      April is the time to plant trees .

      They are planting vegetables .

      [點(diǎn)撥]plant 還可作“工廠”講。

      2 . wonderful 極好的;精彩的 ( 形容詞 )

      That's a wonderful idea .

      What a wonderful invention !

      He told me a wonderful story .

      [點(diǎn)撥]have a wonderful time 過(guò)得極為愉快。

      3 . neither ( 兩者 ) 都不

      [點(diǎn)撥]1 ) ( 兩者 ) 都不的 ( 形容詞 )

      Neither watch works , they are both broken .

      [注意]neither 作形容詞只能與單數(shù)名詞或代詞連用。

      2 ) ( 用于否定句 ) 也不 ( 副詞 )

      John won't go , and neither will I .

      He cannot swim , neither can his brother .

      You did not see him , neither did I .

      3 ) ( 常和 nor 連用 ) 也不 ( 連詞 )

      It is neither blue nor green .

      Neither you nor I am right .

      4 ) ( 兩者 ) 都不 ( 代詞 )

      Neither of them is good health , but they work hard .

      Neither of the stories was true .

      [點(diǎn)撥]neither…nor…連接的兩個(gè)并列成分作主語(yǔ)時(shí),謂語(yǔ)的單復(fù)數(shù)符合就近一致原則。如:Neither you nor he is kind .

      4 . nor 也不 ( 用在 neither , nor , not , never 等否定詞之后 ) ( 連詞 )

      I have neither brothers nor sisters .

      I didn't go , nor did they .

      He doesn't want to go there , nor do I .

      5 . dig 挖,掘 ( 動(dòng)詞 )

      They have started digging their potatoes .

      He was digging a hole .

      The truth was dug out .

      [點(diǎn)撥]dig 的過(guò)去式,過(guò)去分詞,現(xiàn)在分詞分別為 dug , dug , digging。

      6 . hole 洞;坑

      The boat has a hole in each side .

      Please fill the hole in my tooth .

      7 . deep 深的,深厚的,深色的 ( 形容詞 )

      There is a deep well in our village .

      This river is not very deep .

      Her coat is deep red .

      The old man had a deep love for the Party .

      [點(diǎn)撥]be deep in a book 埋頭讀書(shū)。talk deep into the night 談到深夜。deep 常用于具體的深度,包括時(shí)間和空間。deeply 用于抽象的、比喻的“深”。

      8 . earth 土;泥;地球;大地

      Mother planted flowers in the earth .

      The earth is bigger than the moon .

      9 . tie ( 用繩、線等 ) 系;扎;拴 ( 動(dòng)詞 )

      The boy tied the dog to the tree .

      They tied him with cords .

      I am tied to my work all day .

      [點(diǎn)撥]tie sth to… 把……系 ( 拴 ) 在……tie sth , with sth . 用……系 ( 拴 ) … 10 . water 澆水、灌溉 ( 動(dòng)詞 )

      They are watering flowers in the garden .

      They are watering the streets .

      [點(diǎn)撥]water 作抽象名詞和物質(zhì)名詞表示一般概念時(shí)前面通常不用冠詞,只有當(dāng)它被一個(gè)限制性定語(yǔ)修飾時(shí)才加冠詞。

      11 . untrue 不真實(shí)的;假的 ( 形容詞 )

      It is an untrue story .

      He is untrue to his friends .

      [點(diǎn)撥]untrue 是由形容詞 true 加前綴 un - 構(gòu)成的。

      12 . forest 森林

      Most part of the country is made up of forest .

      They travel in the forest once a year .

      [點(diǎn)撥]forest 指占地廣大,而人跡稀少,有鳥(niǎo)獸棲息的森林,而 wood 指樹(shù)林,人工培植林,或已開(kāi)發(fā)的林子。

      13 . sand 沙;沙子;沙灘

      A child likes to play with sand .

      The children are playing games on the sands .

      [點(diǎn)撥]sand 作“沙,沙子”講是不可數(shù)名詞,當(dāng)“沙灘”講是可數(shù)名詞。

      14 . copy 照搬;謄寫(xiě);模仿 ( 動(dòng)詞 )

      Copy the sentence down .

      He copied a page of the book .

      Copy this down in your notebook .

      I want you to copy carefully from this model .

      [點(diǎn)撥]Copy in the examination 考試作弊,Copy down 記下,抄下。

      15 . northern 北方的;北部的 ( 形容詞 )

      The northern part of our country is very cold in winter .

      [點(diǎn)撥]northern 無(wú)比較等極形式,類似的還有:southern 南方的,eastern 東方的,western 西方的。

      16 . million 百萬(wàn);百萬(wàn)個(gè) ( 人或物 )

      There are more than five million people in this city .

      Millions of people went to the streets to welcome the king .

      [點(diǎn)撥]million 前如有數(shù)詞,million 則不加 s , 如加了s 后必接 of。

      17 . toward ( s ) 向;朝;對(duì)于 ( 介詞 )

      A group of students are walking toward ( s ) she sea .

      She was walking toward ( s ) town when I met her .

      [點(diǎn)撥]在后跟人時(shí),towards含有“態(tài)度性”。如:

      Is he friendly towards her ?

      What are his feelings towards us ?

      18 . among 在……之中 ( 介詞 )

      She was sitting among her children .

      I found him among the crowd .

      There is a small house among the trees .

      [點(diǎn)撥]among 表示三者或三者以上的之間。

      19 . mountain 山;山脈

      It is difficult to get to the top this mountain .

      They are climbing the mountain .

      The mountains were covered with snow .

      [點(diǎn)撥]in ( the heart of ) mountains 在 ( 深 ) 山中,a mountain of difficulties 困難重重。

      20 . grow

      ①種植;栽培 ( 及物動(dòng)詞 )

      In early spring we grow trees around our house .

      ②生長(zhǎng),成長(zhǎng) ( 不及物動(dòng)詞 )

      Plants cannot grow without water .

      The rice is growing fine .

      He has grown into a fine young man .

      ③發(fā)展,增長(zhǎng) ( 不及物動(dòng)詞 )

      They city is growing fast .

      The population is not growing so fast in this area .

      [點(diǎn)撥]grow 的過(guò)去式,過(guò)去分詞為 grew , grown . grow 還可作系動(dòng)詞用,后接形容詞作表語(yǔ),grow up 長(zhǎng)大,成人。

      單元詞組思維運(yùn)用

      1 . neither…nor 既不……也不

      He is neither Japanese nor Chinese .

      Neither he nor I know that .

      [注意]當(dāng)它用來(lái)連接兩個(gè)主語(yǔ)時(shí),其謂語(yǔ)動(dòng)詞的形式取決于后一個(gè)主語(yǔ)的人稱。試比較:

      Neither you nor I am right .

      Neither you nor he is right .

      Neither he nor you are right .

      2 . knock…into 把……插進(jìn);把……敲進(jìn)

      Knock a long , strong stick into the earth next to the hole .

      A long stick must be knocked into the earth .

      Knock the nail into the wall , please .

      3 . make sure 務(wù)必;查明;弄確實(shí)

      Make sure that it is straight .

      Make sure that all the windows are closed .

      Make sure you get there on time .

      I think there is a train at 5 : 15 , but you'd better make sure .

      Have you made sure of the time of the train ?

      4 . in a few years' time 幾年之后

      In a few years' time , we hope to cover those mountains , too !

      [注意]in… 's ( s' ) time , 表示“在某時(shí)間之后”,又如:

      She is going to Beijing in three days' time .

      I'll be back in a week's time .

      He will be back in an hour's time .

      He has promised to pay me in three months' time .

      5 . tie…to 把…捆在 ( 拴在 ) ……

      He tied the horse to the tree .

      They tied the bad to the big tree .

      When he woke up , he found himself tied down to the ground .

      6 . be just right 正合適,合適的。

      The weather is just right for travelling .

      This book is just right for reading .

      7 . stop…from doing 制止……不使……;阻止

      It will stop the sand from moving towards the rich farmland in the south .

      The Great Green Wall will stop the wind from blowing the earth away .

      8 . point to ( point at ) 指向,指引

      He points to the high mountains far away .

      He pointed the way to the bookstore ( station ) .

      He pointed to ( at ) the forest .

      9 . far away 遙遠(yuǎn)

      The moon is far away from the earth .

      She lives far away .

      10 . thanks to 由于,幸虧,多虧

      Thanks to the doctor , I am well again .

      Thanks to John's kind help , we finished it early .

      11 . more or less 或多或少,大約

      He knows some English more or less .

      It is helpful more or less .

      They were more or less hungry .

      The bicycle costs $100 more or less .

      12 . be covered with 覆蓋著,盡是

      The table is covered with a cloth .

      The mountains were covered with snow .

      The trees are covered with flowers .

      二、學(xué)海導(dǎo)航

      【 學(xué)法指要 】

      單元句型思路明晰

      1 . so that 引導(dǎo)狀語(yǔ)從句的句型

      Put the tree in the hole so that it is straight . 把樹(shù)放在洞內(nèi),讓它立直。

      [明晰]so that 的意思是“以便,為了”,引導(dǎo)一個(gè)目的狀語(yǔ)從句。又如:

      We got up very early so that we could catch the train .

      I ran very fast so that no one should catch up with me .

      Close the door so that it is warm is the room .

      2 . 現(xiàn)在進(jìn)行時(shí)的被動(dòng)語(yǔ)態(tài)句型

      Today , too many trees are still being cut down it the USA . 在美國(guó),今天還

      有大量的樹(shù)在被人們砍伐著。

      [明晰]句中的 are being cut down 是現(xiàn)在進(jìn)行時(shí)的被動(dòng)語(yǔ)態(tài)。又如:

      More Great Green Walls are being built all over the world .

      The TV set is being repaired right now .

      3 . the + 比較級(jí),the + 比較級(jí)

      The more , the better . 越多越好。

      [明晰]①“the + 比較級(jí),the + 比較級(jí)”,意思是“越……越……!庇秩纾

      - What size box do you want ?

      - The bigger , the better .

      Ask all of them to the party , the more , the better .

      The more carefully you do the experiment , the better .

      Start your work . The sooner , the better .

      ②“the + 比較級(jí),the + 比較級(jí)”的完整句式是“the + 比較級(jí) + 主 + 謂,the + 比較級(jí) + 主 + 謂”,如:

      The more people you know , the less time you have to see them .

      The more I gave him , the more he wanted .

      The more he eats , the fatter he gets .

      The harder you work , the more you will learn .

      The earlier we start our work , the sooner we can finish it .

      4 . 表示計(jì)量的句型“數(shù)詞 + 名詞 + 形容詞”

      The Great Green Wall is 7 . 000 kilometres long , and between 400 - 1 , 700 kiiometres wide . 綠色長(zhǎng)城長(zhǎng)7000公里,寬400至1,700公里。

      [明晰]表示計(jì)量的句型的常用結(jié)構(gòu)形式:

      “主 + 謂 + 數(shù)詞 + 表示單位的名詞 + 形容詞”用來(lái)表示“某物有多長(zhǎng) ( 寬、深、高 ) 等,又如:

      The wall is three metres high .

      The stick is five inches long .

      The boy is eight years old .

      單元難點(diǎn)疑點(diǎn)釋疑

      1 . Come to school in your old clothes tomorrow ! 明天你穿舊衣服到學(xué)校來(lái)。

      [釋疑] ( 1 ) 句中的介詞 in 可表示服飾的穿著。例如:

      Do you know the girl in the hat ?

      He is often in brown .

      What shall I go in ?

      2 . It's Tree Planting Day . We're going to plant some trees .( 明天是 ) 植樹(shù)節(jié),我們將種一些樹(shù)。

      [釋疑]plant 一詞還可用作名詞,意思是“植物”。例如:

      There are different kinds of plants on that farm .

      Plants can bring us much fresh air . 植物可帶給我們大量新鮮的空氣。

      3 . Really ? Wonderful !

      [釋疑] ( 1 ) wonderful 常用于對(duì)事物的贊嘆、稱許及驚訝,用以表達(dá)說(shuō)話者分外驚奇的心情。在口語(yǔ)中使用時(shí)相當(dāng)于great . 例如:

      It's wonderful that you have won the football match .

      His uncle is a wonderful maths teacher .

      ( 2 ) wonderful 是在名詞 wonder ( 驚奇,奇跡 ) 后加上 -ful 構(gòu)成的形容詞,常見(jiàn)的還有:use - useful , help -helpful, care-careful, beauty -beautiful

      4 . HOW TO PLANT A TREE 如何種樹(shù)

      [釋疑] ( 1 ) 英語(yǔ)中用作標(biāo)題的文字,一般常用大寫(xiě)。

      ( 2 ) 不定式前面常?梢愿鶕(jù)意思的需要與疑問(wèn)副詞或疑問(wèn)代詞一起構(gòu)成短語(yǔ)

      We don't know when to go there .

      The problem is where to plant trees .

      We were not sure what to do at that time .

      5 . The ground must be just right - neither too wet nor too dry . 地面必須剛好適宜 , 既不太潮濕也不太干燥。

      [釋疑] ( 1 ) neither…nor…連詞,“既不……也不……”之意。分別放在兩個(gè)平行的述說(shuō)對(duì)象的前面。例如:

      He is neither tall nor short .

      I can neither sing nor dance .

      Neither you nor he knows French .

      上面句中的謂語(yǔ)動(dòng)詞形式取決于后一個(gè)主語(yǔ)的人稱,這一點(diǎn)要特別注意。請(qǐng)比較:

      Neither he nor you know French .

      ( 2 ) neither 一詞單獨(dú)使用時(shí),可作副詞或代詞,意為“ ( 兩者 ) 都不”,下列句中的名詞或動(dòng)詞應(yīng)用單數(shù)形式。例如:

      Neither answer is right .

      Neither of them knows me .

      6 . Knock a long strong stick into the earth next to the hole . Make sure that it is straight . 把一根又長(zhǎng)又結(jié)實(shí)的木棍順著洞邊插進(jìn)土里,一定要把它立直。

      [釋疑] ( 1 ) knock…into… “把……插進(jìn)……;把……敲進(jìn)……”。例如:

      Please help me knock the nail into the wall .

      ( 2 ) next to “挨著”。例如:

      His bedroom is next to mine .比較:

      He lives in the next bedroom .

      Next to our school is a big lake .

      Who sits next to you ?

      ( 3 ) make sure “查明,弄確實(shí)”。例如:

      You must make sure that he didn't lie .

      It's hard for me to make sure whose handwriting is better .

      7 . Put the tree in the hole so that it is straight . 把樹(shù)放在洞內(nèi),讓它立直。

      [釋疑]so that 意為“以便”,“為了”,引出一個(gè)表示目的的狀語(yǔ)從句。又如:

      He gets up early in the morning so that he can catch the early bus .

      Close the door so that it is warm in the room .

      8 . Tie the tree to the top of the stick to keep it straight . 把樹(shù)和木棍的頂端捆好,以保持樹(shù)能直立。

      [釋疑] ( 1 ) tie…to…“把……捆在……”。例如:

      They tied the bad man to the big tree .

      Tie his hands to the back of the chair .

      to keep it straight 是動(dòng)詞不定工,在句中作狀語(yǔ),表示捆樹(shù)的目的。straight 是賓語(yǔ) it 意義上的補(bǔ)充和延伸,所以叫做賓語(yǔ)補(bǔ)足語(yǔ)。又如:

      We always keep our classroom clean .

      Don't touch the machine . You must keep yourselves safe .

      ( 3 ) 在句中常用來(lái)作賓語(yǔ)補(bǔ)足語(yǔ)的還有動(dòng)詞不定式、分詞、名詞等。例如:

      We all call him Lao Wang . 我們都叫他老王。

      Who helped you to wash these clothes ?

      I saw him going into the office when I came back last night .

      9 . Water it well , as often as possible . 盡可能經(jīng)常地給樹(shù)澆好水。

      [釋疑] ( 1 ) water 可用作動(dòng)詞,意為“給……澆水”。

      英語(yǔ)中有些表示物質(zhì)的名詞也可用作動(dòng)詞,試比較下列句中 fish 及 rain 的詞性。

      He likes to fish on Sunday . But he doesn't like eating fish very much .

      We had much rain last month , but it hasn't rained these days .

      ( 2 ) 類似 as often as possible 的說(shuō)法還有:

      as soon as possible 盡可能的快 ( 指時(shí)間 ) , as fast as possible 盡可能的快 ( 指速度 ) ,as more as possible 盡可能的多, as early as possible 盡可能的早

      10 . Why was the Great Green Wall built ? 為什么要營(yíng)造綠色長(zhǎng)城 ?

      [釋疑] ( 1 ) The Great Green Wall 指的是三北防護(hù)林,即:西北、東北和華北。

      整個(gè)防護(hù)林橫貫十三省、市、自治區(qū)。

      ( 2 ) 該句為一般過(guò)去時(shí)被動(dòng)語(yǔ)態(tài)。

      11 . In 1850 , about a third was covered by forests . 1850年,大約三分這一 ( 的美國(guó)國(guó)土 ) 被森林覆蓋。A third 即為 one third 或 1/3。

      [釋疑]英語(yǔ)中分?jǐn)?shù)的文字表達(dá),分子用基數(shù)詞,分母用序數(shù)詞,先讀分子,后讀分母。當(dāng)分子大于1時(shí),分母用相應(yīng)的復(fù)數(shù)。例如:2 / 3 讀作 two thirds . 5 / 7 讀作 five sevenths .

      12 . A lot of good land has gone with them , leaving only sand . 大片的肥沃土壤隨著森林的消失而流失,只留下一片荒沙。

      [釋疑] ( 1 ) leaving only sand 在句中作狀語(yǔ),表示土壤流失后的景象。

      ( 2 ) leave 常用的兩個(gè)意思為“離開(kāi)”及“留下”。請(qǐng)比較下面兩個(gè)句子:

      The mother left the baby and hurried to work .

      Don't leave your baby along in the room .

      13 . Today , too many trees are still being cut down it the USA . 如今,在美國(guó),大量的樹(shù)木仍遭砍伐。

      [釋疑]句中的 are being cut down 是現(xiàn)在進(jìn)行時(shí)的被動(dòng)語(yǔ)態(tài)。

      14 . China does not want to copy the USA's example . 中國(guó)不愿意步美國(guó)的后塵。

      [釋疑]copy 在此意為“照抄”,“照搬”。例如:

      Copy a drawing . 臨摹圖畫(huà)。

      He is copying the sentences on the blackboard .

      15 . The Great Green Wall will stop the wind from blowing the earth away .

      [釋疑]stop…from doing sth . “阻止……以免……”,“防止……做某事”。

      I have often stopped myself from doing something wrong .

      You must stop that big dog from coming into the house .

      16 . They must be built all over world . 全世界都必須營(yíng)造綠色長(zhǎng)城。

      [釋疑]含情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)結(jié)構(gòu):情態(tài)動(dòng)詞 + be + 過(guò)去分詞,又如:

      This work must be finished in a week .

      The trees should be watered often .

      In south China , rice may be harvested three times a year .

      17 . Many thousands of trees must be planted every year . 每年都得裁成千上萬(wàn)株樹(shù)。

      [釋疑] ( 1 ) many thousands of“數(shù)千;萬(wàn)千上萬(wàn)”,thousand 在此是名詞。又如:hundreds of 好幾百, millions of 數(shù)百萬(wàn)

      ( 2 ) hundred , thousand , million 也常常用作數(shù)詞,此時(shí)后面不能加 s。例如:

      We've learned about eight hundred English words .

      That farmer had over five thousand ducks .

      18 . The more , the better . 越多越好。

      [釋疑]這種句式的結(jié)構(gòu)為:“the + 比較級(jí),the + 比較級(jí)”,意為“越……越……”。請(qǐng)看:

      Ask all of them to come to the party . The more , the better .

      Start your work . The sooner , the better .

      The more I think of it , the happier I am .

      The harder you work , the greater progress you will make .

      19 . This year alone , we've already planted ten thousand trees . 僅僅在今年,我們已經(jīng)裁了一萬(wàn)棵樹(shù)。

      [釋疑]alone 是形容詞,在句中意為“僅僅”。又如:

      The people live by bread alone .

      We all think that he alone can do it .

      20 . But we're growing a lot more now , thanks to the Green Wall . 然而,幸虧有了綠色長(zhǎng)城,我們現(xiàn)在種植了更多的糧食作物。

      [釋疑]thanks to…構(gòu)成副詞短語(yǔ),意為“幸虧”,“由于”例如:

      Thanks to their help , we won the match .

      We arrived at the railway station in time , thanks to that bus driver .

      21 . Is it straight ? More or less . 樹(shù)放直了嗎 ? 基本上是直的。

      [釋疑]more or less “或多或少,差不多”。例如:

      What he said is more or less true .

      22 . 同義詞 wear , dress , in , put on , try on 的區(qū)別

      [釋疑] ( 1 ) wear ( 穿,戴 ) ,表示穿著的狀態(tài),它不僅可以表示“穿著”某種

      衣服,還可廣義地用于穿鞋、穿襪、戴帽、戴手表、戴眼鏡等。如:

      She was wearing a red dress ( a pair of white gloves , glasses , a gold ring , a new watch ) at the ball that night . 那天晚上在舞會(huì)上她穿著紅色連衣裙 ( 戴著一副白手套,眼鏡,一枚金戒指,一塊新手表 ) 。

      ( 2 ) dress ( 穿,穿著 ) ,既可表示穿著的動(dòng)作,又可表示穿著的狀態(tài),只用于穿衣。當(dāng) dress 作及物動(dòng)詞時(shí),后面的賓語(yǔ)只能是人。

      Have you finished dressing ?

      He dressed and went out .

      She was dress in with .

      Mother dressed the child .

      ( 3 ) in ( 穿著,身著 ) ,表示狀態(tài)。in 是介詞。

      The PLA men are in green uniform .

      The comrade in blue is director of the play .

      Come to school in your old clothes tomorrow !

      ( 4 ) put on 強(qiáng)調(diào)“穿,戴”的動(dòng)作,不能與表示持續(xù)性的時(shí)間狀語(yǔ)連用。如:

      He put on his coat and went out .

      He put on his glasses to read the letter .

      You don't need to put on your cap .

      ( 5 ) try on ( 試穿 ) ,表示動(dòng)作,如:

      I went to the tailors to try on my new suit .

      Several pairs f shoes were tried on , but none of them were satisfactory .

      Can I try it on ?

      Mary was trying on a new dress .

      23 . must be 的幾種意義

      [釋疑]①在被動(dòng)語(yǔ)態(tài)中,表示“必須,應(yīng)當(dāng)”即:

      “must + be + 過(guò)去分詞”,如:

      Young trees must be looked after .

      This thing must be handled with care .

      A greenhouse must be built first .

      This must be done as soon as possible .

      ②must be 表示一種推測(cè),意思是“大概是”,“可能是”,“準(zhǔn)是”,如:

      He must be in the workplace now .

      Grandpa Li must be over seventy now .

      I'm afraid you must be right .

      Ah ! it must be more delicious !

      ③must be 表示“必須是”,“一定是”。如:

      The ground must be just right - Neither too wet nor too dry .

      The answers must be right .

      24 . 表示命令、請(qǐng)求和指示的交際用語(yǔ)

      [釋疑]命令、請(qǐng)求或指示對(duì)方干什么或不要干什么,在英語(yǔ)中最常用的是第二人稱祈使句,主語(yǔ) you 通常不表示出來(lái)。祈使句的肯定式以原形動(dòng)詞開(kāi)始,句首或句尾可以加 please ; 祈使句的否定式以“Don't + 動(dòng)詞原形”開(kāi)始。例如:

      Put the tree in the hole so that it is straight .

      Water the trees as often as possible .

      Don't dig the hole too large .

      25 . It's best to do sth . 最好是…… ( 干某事 )

      [釋疑]這是表示建議的交際用語(yǔ),意思相當(dāng)于“You'd better do sth . ” ( 你最好干某事 ) 。如 It's best to plant trees in spring because it's warmer . ( = You'd better plant trees in spring because it's warmer . )

      It's best to water well when the earth is dry .

      It's best to fill in the hole with earth .

      It's best to harvest at the right time .

      It's best to come to school in your old clothes tomorrow because we are going to plant trees in the park .

      【 妙文賞析 】

      The Lose Outweights the Gain

      Joel Adams laments , “When we went on vacation two years ago , burglars broke in and stole $250 . So , last year I got smart , I left all the lights on and turned on all the radios and TV s . The burglars were afraid to show up and didn't get a cent - but the electric company got $523 ! ”

      得不償失

      喬爾亞當(dāng)斯悲嘆道:“兩年前我們外出度假,家里沒(méi)有人,小偷撬門(mén)進(jìn)來(lái)偷走了250

      美元。去年我學(xué)聰明了。我把屋里所有的燈、收音機(jī)和電視都打開(kāi)。小偷不敢來(lái)了,一分錢(qián)

      都沒(méi)偷走,可電力公司向我們要去了523美元 ! ”

      【 思維體操 】

      你能猜出下列謎語(yǔ)嗎 ?

      1 . What letter is a drink ?

      2 . What letter is a part of the face ?

      3 . What letter is an insect ?

      4 . Which letter goes all around an is land ?

      5 . What changes a pear into a pearl ?

      6 . What is the most important thing in the world ?

      7 . What is that which is seen twice in “every day”and four times in“every week”yet only once in“a year” ?

      8 . Why is the letter B like fire ?

      9 . Why is the letter F like a cows tail ?

      10 . What part of London is in France ?

      11 . Why is the letter G like the sun ?

      12 . Why is the letter T like an is land ?

      13 . Why is U the happiest letter ?

      14 . Which letter is most useful to a deaf woman ?

      15 . What letter in the alphabet and travel the greatest distance ?

      16 . What is the end of everything ?

      17 . In what way are the letter O and E neatly keep house a like ?

      18 . What does the letter B do for boys as they grow up ?

      19 . Why is a sewing machine like letter S ?

      20 . Why is a false friend like the letter P ?

      1 . T ( tea ) 2 . I ( eye ) 3 . B ( bee ) 4 . C ( sea ) 5 . L 6 . The letter E , because it is first in everything and everybody . 7 . Letter E . 8 . because it makes oil boil . 9 . Because it is at the end of beef . 10 . The letter N .