比较级＋r，最高级＋st即可。如.ppt

Unit 7;Unit 7 Whats the highest mountain;Section A 3 ;Grammar focus;— Which is the deepest salt lake in the world? — The Caspian Sea is the deepest of all the salt lakes. — Did you know that China is one of the oldest countries in the world? — Yes, I did. It’s much older than the US. ;大多数形容词有三个级。 1. 原级: Structure : as ... as... 像..….一样 e.g. Tim is as tall as Tom. 2. 比较级 (用于两者之间的比较): Structure：形容词比较级＋ than ... e.g. This box is bigger than that one. ;3. 最高级(用于三者或三者以上的比较): Structure: the + 形容词的最高级＋of / in ... e.g. Tom is the heaviest in our class.  He is the most popular in our school.; 规则变化 1) 一般情况下，单音节或双音节的形容词/副词比较级＋er， 最高级＋est。如: clever — cleverer — cleverest few — fewer — fewest small — smaller — smallest 等。 ;2) 以e结尾的词，比较级＋r，最高级＋st 即可。 如： nice — nicer — nicest cute — cuter — cutest large — larger — largest 3) 以辅音字母＋y结尾的变y为i＋er或est 如: easy — easier — easiest happy — happier — happiest 再如：early, busy, heavy, dirty, lazy 也如此。 ;4) 重读闭音节，单辅音结尾的，双写这个辅音字母＋er 或 est的词： ① fat — fatter — fattest ② thin — thinner — thinnest ③ hot — hotter — hottest ④ red — redder — reddest ⑤ wet — wetter — wettest ⑥ big — bigger — biggest ;5) 多音节和部分双音节的词需要在形容词 原级前＋more 构成比较级，＋the most 构 成最高级。如： beautiful － more beautiful － the most beautiful 又如: delicious, popular, important, interesting, expensive, creative 双音节的词如: careful － more careful － the most careful useful － more useful － the most useful;少数单音节词也是这样，如： pleased — more pleased — the most pleased tired — more tired — the most tired b) 不规则变化： good — better — best well — better — best bad — worse — worst many/much — more — most ;far — farther —farthest (距离远) far — further — furthest (程度深) old — elder — eldest (长幼) old — older — oldest (年龄);三者或三者以上??比，表示最高程度时，用“the + 最高级”的结构表示。这种句式一般常有表示比较范围的介词短语。例如： Zhang Hua is the tallest of the three. He works (the) hardest in his class.;2. 最高级可被序数词以及 much，by far，nearly，almost，by no means，