II.连系动词与形容词
象get,grow,become,feel,appear,prove ,look,keep,smell,taste,sound,go,turn,remain等这些动词既可以用作为实义动词又可以用作连系动词，因而要根据上下文语境判断究竟是什么性质的动动词才能正确解题。
请看下面这道选择题：
▲We don't care if a hunting dog smells_____,but we really don't want him to smell_____.
A. well; well B. bad; badly C. well; badly D. badly; bad
第一个“smell”是“闻起来”的意思，是连系动词，用形容词。第二个“smell”是实义动词，用副词来修饰;此外well作形容词是表示人身体好、气色好，用在此句中不行，只能作副词用。答案是B。句意是：“我们不在乎猎狗闻起来难闻，但是我们确实不希望它的嗅觉力差。
III.形容词、副词比较等级的用法
形容词、副词有三个等级：原级、比较级和最高级，其构成形式如下：
规则变化：单音节词和少数双音节词，加词尾-er，-est来构成比较级和最高级
构成法 | 原级 | 比较级 | 最高级 |
一般单音节词未尾加-er,-est | tall | taller | tallest |
以不发音的e结尾的单音词和少数以-le结尾的双音节词只加-r,-st | nice | nicer | nicest |
以一个辅音字母结尾的闭音节单音节词，双写结尾的辅音字母，再加-er,-est | big | bigger | biggest |
"以辅音字母+y"结尾的双音节词，改y为i，再加-er，-est | busy | busier | busiest |
少数以-er,-ow结尾的双音节词未尾加-er,-est | clever narrow | cleverer narrower | cleverest narrowest |
其他双音节词和多音节词，在前面加more，most来构成比较级和最高级 | important easily | more important more easily | most important most easily |
不规则变化
原级 | 比较级 | 最高级 |
good/well | better | best |
bad/ill | worse | worst |
old | older/elder | oldest/eldest |
much/many | more | most |
little | less | least |
far | farther/further | farthest/furthest |
注意：many,old和far比较级及最高级用法的区别
①如果后接名词时，much more +不可数名词，many more +可数名词复数。
②old有两种比较级和最高级形式: older/oldest 和elder/eldest。elder，eldest只用于兄弟姐妹的长幼关系。
My elder brother is an engineer.
Mary is the eldest of the three sisters.
③far有两种比较级，farther，further..在英语中两者都可指距离。
在美语中，father表示距离，further表示进一步
I have nothing further to say.
1.原级的用法
表示双方在程度、性质、特征等某方面相等时，用“as+原级形容词/副词+ as”的结构;表示双方不相等时，用“not so(as)+原级形容词/副词+ as”的结构;表示一方是另一方的若干倍时，用“倍数+ as+原级形容词/副词+ as”的结构。
Xiao Wang is as tall as Xiao Yu.
This building looks not so (as)high as that one.
Miss Xu speaks English as fluently as you .
This room is three times as large as that one.
2.比较级的用法
①双方比较，表示一方超过另一方时，用“比较级+than”的结构表示;
This picture is more beautiful than that one.
注意：
▲比较对象的一致性
请看下面这道选择题：
The weather in China is different from__ __.
A. in America B. one in America C. America D. that in America
本题意为"中国的天气比美国热。"比较的是天气而不是国家，C不能选。A没有名词，后句成分不全，排除。B和D中，B中的one常用来代替可数名词，而that可车以代替不可数或抽象名词，所以选D。
▲要避免将主语包含在比较对象中
(错)China is larger than any country in Asia.
(对)China is larger than any other countries in Asia.
▲注意比较对象的省略或隐藏：有时省略或不点明被比较的对象，而是通过语境来暗示被比较的对象。
请看下面这两道选择题：
If there were no examinations, we should have ___ at school.
A. the happiest time B. a more happier time C. much happiest time D. a much happier time
本题将比较的对象隐藏在虚拟条件句中，即：与没有考试的时候相比。本题答案选D。
I don’t think this film is by far the most boring.I have seen____________.
A. better B. worse C. the best D. the worst
由前文“我认为这部电影不是最没趣的”可知，“我看过(比这部)更差的电影”，省略了than this one。本题答案是B。
It takes a long time to go there by train; it's ________by road.
A. quick B. the quickest C. much quick D. quicker
由语境可知，句末省略了than by train，用比较级。本题答案是D。
②表示一方不及另一方时，用“less+原级+than”的结构表示;
This room is less beautiful than that one.
③表示一方超过另一方的程度或数量时，可在比较级前加表示程度的状语，如even、a lot、a bit、a little、still、much、far、yet、by fay等修饰;
He works even harder than before.
注意：by far通常用于强调最高级。用于比较级时，一般放在比较级的后面，如在前面，应在二者中
间加“the”。
He is taller by far than his brother.
He is by far the taller of the two brothers.
④表示一方随另一方的程度而变化时，用“the +比较级(主语+谓语)，the +比较级(主语+谓语)”
的结构(意为“越……越……”);
The harder he works, the happier he feels.
⑤不与其他事物相比，表示本身程度的改变时，用“比较级+ and+比较级”的结构;
The weather is getting colder and colder.
The girl becomes more and more beautiful.
⑥某些以-ior结尾的形容词进行比较时，用to代替than。这些词有inferior(劣等的，次的)、superior(较
好的，优于……)、junior(资历较浅的)、senior(资格较老的)、prior(在……之前)等;
He is superior to Mr.Zhang in chemistry.
⑦在比较从句中为了避免重复，我们通常用that(those)、one(ones)代替前面出现的名词。that指物,one既可指人又可指物。that可代替可数名词单数和不可数名词，而one只能代替可数名词;
The book on the table is more interesting than that(或the one)on the desk.
A box made of steel is stronger than one made of wood.
