八年级英语Revision of Units 21----23.docVIP

Revision of Units 21----23 　　I. Grammar 　　1. 反身代词的构成及用法 　　　　　 teach oneself　　自学　 　　　 learn by oneself 自学　　　　 enjoy oneself 　 玩得开心　 　　　 help oneself to　自取 　　2. 形容词、副词的比较等级 　　　　1）形容词、副词比较级、最高级的构成：规则变化与不规则变化（见课本第二册下P.152） 　　　　2）形容词、副词三个等级的用法 　　　　　 原级比较： 　　　　　 as… as …　　　　　　　English is as important as math. Tom runs as fast as Jim.　　　 not as (so)… as…　 　It is not as (so) warm today as yesterday. 　　　　 　　　　　　　　　　　　He did not come to school as (so) early as John. 　　　　　 可修饰原级的词： very，so，too，quite，rather 　　　　　 两者之间的比较： 主+谓+比较级+than+被比的事物 　　　　　 This cake is more delicious than that one.　 　　　　　 I jump higher than you. 　　　　　 Which picture is more beautiful，this one or that one? 　　　　　 注意：这个句型无否定式。如：I’m taller than you.不可说You’re not taller than me.只能说You are shorter than me. 或You’re not as tall as me. 　　　　　 She sings better than any other student in her class.（用比较级的句型表达最高级的意思）　　　 She sings better than the other students in her class.　 （用比较级的句型表达最高级的意思）　　　 可修饰比较级的词：much，a little，even 　　　　　 三者、或三者以上之间的比较：主+谓+(the)+最高级+范围（常由in或of短语表示） 　　　　　 Beijing is one of the most beautiful cities in the world. 　　　　　 Mary studies (the) most carefully in her class.　 　　　　　 Lucy sings (the) best of all. 　　　　　 Who runs fastest，tom，Jim or Bill? 　　　　　 注意：形容词最高级前必须用the， 副词最高级前用不用均可。 　　　　3. 冠词a，an，the的用法（见课本第二册P.153---P.155） 　　　　II. 交际用语：　　有关运动的表达、表示肯定与不肯定、购物 　　　　III. Language points 　　1. fall off…(从……) 掉下 = fall down from… 　　　　　 He fell off the tree when he picked up the apples.　 　　　　　 He fell down from the tree just now. 　　　　2. teach oneself = learn sth. (all) by oneself (自学) 　　　　　 I taught myself French when I was young. 　　　　　 I learnt French (all) by myself when I was young. 　　　　　 常见短语：　　　 hurt oneself　　　　 enjoy oneself 　　　　　 dress oneself　　　　　 help oneself 　　　　　 lose oneself　　　　　 by oneself　　　　　 come to oneself 苏醒、恢复知觉　　　3. write down　 write (a letter) to　 write about sth　 　　　　4. knock at = knock on　 knock into 撞上 　knock over　 弄倒、打翻