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the + a./ad.最高级＋of / in（范围） ...
He is the tallest of the three. He runs (the) fast in his class.
2. a./ad.比较级和最高级的变化规则
1）规则变化
(1) 一般情况下，＋er或 ＋est eg:clever, few,small,light
(2) 以e结尾的词，＋r或＋st
eg：nice, cute, large,
(3) 以辅音字母＋y结尾的变y为i＋er或est
eg: easy,happy,early, busy, heavy, dirty, lazy
(4) 双写 ＋er 或 est
eg: fat,thin,hot,red,wet ,big
(5) 多音节和部分双音节的词,＋more或
the most
eg: beautiful ,delicious, popular, important, interesting,expensive,creative,careful,useful
少数单音节词也是这样
eg： pleased,tired
2) 不规则变化： good, well
bad,ill
many, much
far
little
② 同级比较(pron.)
e.g. The weather here is colder than that in Xi’an. Our school is bigger than yours.
③ “a/an + 比较级”?表示“又一，再一”
e.g. Lily has a doll, but she wants?a bigger one.
④ 隐性比较（没有than的情况）
e.g. Who runs faster, Lucy or Lily? You’d better come earlier next time. He worked hard last term, but he works
even harder this term.
⑤ 越来越... 比较级 + and + 比较级
It’s getting colder and colder.