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初中英语Section B复习ppt课件
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这是一份初中英语Section B复习ppt课件,共31页。PPT课件主要包含了longer,faster,best,hotter,deepest,happier,happiest,better,thinner,thinnest等内容,欢迎下载使用。
学习目标1. 熟练掌握形容词、副词原级、比较级、最高级的核心用法2. 牢记比较级/最高级的规则变化与不规则变化,避免出错3. 学会英语中三位数及以上大数的读写规则,精准表达数据4. 能完成填空、选择、句型转换、语篇填空等多种题型练习
知识点1:比较级/最高级核心概念1. 核心用途:描述人或事物在程度、数量上的差异2. 三级别区分:原级(自身特征)、比较级(两者对比) 最高级(三者及以上对比)3. 本单元贴合自然奇观主题,侧重结合场景运用 (如描述山峰高度、沙漠面积、瀑布壮观程度)
原级用法详解含义:描述人或事物本身的特征,无对比意味常用句式(2种核心): ① as + 原级 + as (和……一样,表同等程度) ② nt as/s + 原级 + as (不如……,表程度差异)注意:修饰动词用副词原级,修饰名词用形容词原级
原级例句精讲(结合自然奇观)1. The Amazn River is as lng as sme big rivers.(原级肯定) (亚马逊河和一些大河一样长。)2. This lake is nt as deep as the Dead Sea.(原级否定) (这个湖不如死海深。)3. 错误:He runs as fastly as his brther.(fastly为错词)4. 正确:He runs as fast as his brther.(fast副词原级)
比较级用法详解含义:用于两者之间的对比,突出“更……”常用句式(2种重点): ① A + be/动词 + 比较级 + than + B (A比B更……) ② the + 比较级 + f the tw (两者中更……的一个)注意:than后接的对象要与主句主语对应一致
比较级例句精讲(结合自然奇观)1. The Gbi Desert is bigger than the Taklamakan Desert.(A比B) (戈壁沙漠比塔克拉玛干沙漠大。)2. This waterfall is mre beautiful than that ne.(多音节词) (这个瀑布比那个更美丽。)3. He is the taller f the tw guides.(两者中更……) (他是两个导游中更高的那个。)
最高级用法详解含义:用于三者及以上之间的对比,突出“最……”常用句式(2种核心): ① the + 最高级 + 范围(in/f短语,明确比较范围) ② ne f the + 最高级 + 复数名词(最……之一)注意:最高级前必须加定冠词the,范围不可遗漏
最高级例句精讲(结合自然奇观)1. Munt Qmlangma is the highest muntain in the wrld.(in短语范围) (珠穆朗玛峰是世界上最高的山峰。)2. Victria Falls is ne f the mst famus waterfalls in Africa.(ne f结构) (维多利亚瀑布是非洲最著名的瀑布之一。)3. 错误:It is biggest lake in ur cuntry.(缺少the)4. 正确:It is the biggest lake in ur cuntry.
比较级/最高级变化规则(一):规则变化1. 单音节词:直接加 -er(比较级)/ -est(最高级) 例:tall → taller → tallest;fast → faster → fastest2. 以 -e 结尾:直接加 -r(比较级)/ -st(最高级) 例:nice → nicer → nicest;late → later → latest3. 重读闭音节(辅+元+辅):双写尾字母加 -er/-est 例:thin → thinner → thinnest;big → bigger → biggest
比较级/最高级变化规则(二):规则变化1. 以辅音字母 + y 结尾:变y为i,加 -er/-est 例:busy → busier → busiest;happy → happier → happiest2. 多音节词(3个及以上音节):加 mre/mst 例:beautiful → mre beautiful → mst beautiful 例:carefully → mre carefully → mst carefully3. 注意:部分双音节词可加 -er/-est 或 mre/mst(如clever)
比较级/最高级变化规则(三):不规则变化 特点:无固定变化规则,必须牢记,易错点重点记忆 核心不规则词(本单元高频): ① gd / well → better → best(好/好地) ② bad / badly → wrse → wrst(坏/坏地) ③ far → farther / further → farthest / furthest(远)提示:far的两种形式均可,farther侧重距离,further侧重程度
小试牛刀(单句填空)用所给词的比较级或最高级填空,注意变化规则1. This river is ________ (lng) than that ne.2. She sings __________________ (beautiful) in ur class.3. He runs ________ (fast) than his friend.4. This is the ________ (gd) bk I have ever read.5. The weather is getting ________ (ht) and ________ (ht).
the mst beautifully
知识点2:大数表达 本单元用途:描述自然奇观的面积、长度、高度等数据 (如沙漠面积、山峰高度、河流长度)核心原则:英语大数从右向左,每三位为一组划分关键单位(牢记,无复数): thusand(千)、millin(百万)、billin(十亿)重点:三位数及以内的读法的基础,四位数及以上分组读
大数表达规则(一):三位数及以内1. 百位数字 + hundred,百位与十位之间用and连接(英式) 美式英语中,and可省略,两种读法均正确2. 具体示例: ① 235 → tw hundred (and) thirty-five ② 708 → seven hundred (and) eight ③ 999 → nine hundred (and) ninety-nine3. 注意:十位为0时,直接读百位+and+个位
大数表达规则(二):四位数及以上分组方法:从右向左每三位为一组,依次标注thusand、millin读法:每组按三位数读法读,后接对应单位(无复数)四位数示例: ① 5,678 → five thusand, six hundred (and) seventy-eight ② 10,000 → ten thusand提示:末尾有多个0时,直接读单位即可,不读0
大数表达规则(三):百万及以上核心单位:millin(百万)= 1,000,000 billin(十亿)= 1,000,000,000(本单元暂不侧重) 具体示例: ① 3,450,000 → three millin, fur hundred (and) fifty thusand ② 8,000,000 → eight millin注意:单位thusand、millin不可加s(即使前面是复数数字)
大数表达小试牛刀(读写练习)一、用英文写出下列数字1. 3,456 → ________________________________2. 12,789 → ________________________________3. 560,000 → ________________________________4. 7,000,000 → ______________________________二、写出下列英文对应的数字1. six thusand, tw hundred and thirty → _______
three thusand, fur hundred (and) fifty-six
twelve thusand, seven hundred (and) eighty-nine
five hundred and sixty thusand
seven millin
易混点辨析(一):比较级/最高级易错点易错点1:最高级前忘记加the(重中之重) 错误:It is tallest building in the city. 正确:加the易错点2:多音节词误用 -er/-est 错误:This is amazinger than that. 正确:mre amazing易错点3:不规则变化记错(如gd的比较级写成gder)易错点4:than后对象不对应(如人比事物)
易混点辨析(二):大数表达易错点易错点1:单位加s(如ten thusands) 正确:ten thusand(单位永远用单数)易错点2:分组错误(应从右向左每三位分组)易错点3:百位与十位之间漏加and(英式)易错点4:数字书写时,逗号位置错误 正确:5,895(每三位一个逗号),错误:58,95
专项练习一:词形变化(基础巩固)写出下列单词的比较级与最高级(涵盖规则/不规则)1. deep → ________ → ________2. happy → ________ → ________3. well → ________ → ________4. slwly → ________________ → ________________5. thin → ________ → ________6. far → ________________ → ________________7. nice → ________ → ________8. terrible → ______________ → ______________
farther/further
farthest/furthest
mre terrible
mst terrible
专项练习二:单项选择(能力提升)从A、B、C、D中选出最佳答案1. The Yellw River is ________ river in China. A. lng B. lnger C. lngest D. the secnd lngest2. This canyn is ________ than any ther canyn in Asia. A. wide B. wider C. widest D. the widest3. He speaks English ________ as his sister. A. as gd B. as well C. s gd D. s well
专项练习二:单项选择 4. It is ne f ________ deserts in the wrld. A. famus B. mre famus C. the mst famus D. mst famus5. The muntain is 8,848 metres ________. A. high B. higher C. highest D. the highest6. Which is ________, the Sahara r the Gbi? A. big B. bigger C. biggest D. the biggest7. She sings ________ than all the ther girls in her class. A. beautiful B. mre beautiful C. beautifully D. mre beautifully
专项练习三:句型转换(拓展提升)按要求改写句子,每空一词,保持原意不变1. The Nile is lng.(改为最高级,范围in the wrld) The Nile is ________ ________ ________ in the wrld.2. This waterfall is amazing.(改为比较级,与that ne对比) This waterfall is ________ ________ than that ne.3. Tm runs fast. Jim runs fast t.(用原级比较合并) Tm runs ________ ________ ________ Jim.
the lngest river
mre amazing
as fast as
专项练习三:句型转换(续)4. This is a big lake.(改为最高级,范围in ur prvince) This is ________ ________ ________ in ur prvince.5. He is tall. His brther is taller.(合并为比较级句子) His brther is ________ ________ him.6. This bk is nt interesting. That bk is mre interesting.(合并) That bk is ________ ________ than this ne.
the biggest lake
taller than
mre interesting
专项练习四:大数表达专项一、用英文写出下列数字1. 4,789 → ________________________________2. 23,567 → ________________________________3. 780,000 → ________________________________4. 9,200,000 → ________________________________二、写出下列英文对应的阿拉伯数字1. five thusand, three hundred and twenty → ________2. fur millin, five hundred thusand → _____________
fur thusand, seven hundred (and) eighty-nine
twenty-three thusand, five hundred (and) sixty-seven
seven hundred and eighty thusand
nine millin,tw hundred thusand
专项练习五:语篇填空(综合运用)阅读短文,用所给词的适当形式或大数表达填空Last year, I visited the Sahara Desert. It is ne f the 1. ________ (big)deserts in the wrld. Its area is abut 2. ____________________________ (960万) square kilmetres.As we walked farther, the wind became 3. ________ (strng) and 4. ________ (strng).The desert is much 5. ________ (dry) than any ther place I have been t.We saw a small asis (绿洲) abut 6. _____________ (5,000) metres away.
nine millin, six hundred thusand
five thusand
专项练习六:判断正误并改正(易错巩固)判断下列句子正误,对的打“√”,错的打“×”并改正1. This is mre gd than that bk. ( ) 改正:________2. He is the taller student in ur class. ( ) 改正:________3. The number is ten thusands, five hundred. ( ) 改正:________4. She sings as beautifully as her teacher. ( ) 改正:________5. This is the mst amazing place I have ever seen. ( ) 改正:________
This is better than that bk.
He is the tallest student in ur class.
The number is ten thusand, five hundred.
知识点总结(一):比较级/最高级1. 三级别核心:原级( )、比较级(than)最高级(the + 最高级 + 范围/ne f结构)2. 变化规则:牢记规则变化(5类)和不规则变化(3组核心词)3. 易错点:最高级加the、多音节词用mre/mst、不规则词记忆4. 运用技巧:结合语境判断对比对象(两者/三者及以上)
知识点总结(二):大数表达1. 核心原则:从右向左每三位分组,单位thusand/millin(无复数)2. 三位数读法:百位+hundred+(and)+十位+个位3. 四位数及以上:分组读,每组按三位数读法+对应单位4. 易错点:单位不加s、逗号位置正确、and的用法(英式)5. 本单元重点:千、百万的读写,结合自然奇观数据运用
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