形容词相副词在语法结构上都有比较级和最高级，它们的构成方法基本上一样，都与音节多少有关，有些形容词相副词有特殊的比较级和最高级形式。二者基本分为同级比较、比较级和最高级三种形式。
    1.形容词与副词的用法
    形容词中有词形相近的，也有词义相近的，应注意区别。如:
    l)behind(在后的)--hind(后部的)，considerate(周到的，体贴的)--considerable(应考虑的)，eminent(闻名的)--imminent(紧迫的)，gracious(亲切的)--graceful(优雅的)，live(有生命的)--aIive(活的)，industrious(勤劳的)--industriaI(工业的)，like(同样的)--alike(同样的，仅作表语)，opposite(相对的)--opposing(反对的)，perspective(透视的)--respective(各自的)，sensitive(伤感的)--sensible(明显的)，etc。例如:
    ①We did enjoy our staying in Beijing，and Mrs Yan is really considerate.Professor Li has many world-famous inventions，and he is respectable to us.
    ②As anyone knows that we use our front teeth for biting and our hind teeth for chewing.
    ③It's a considerable success for him.
    2)elemental(初步的)--fundamental(基本的),eligible(合格的)--capable(能干的)，flexible(灵活的)--changeable(可改变的)，initial(最初的)--preliminary(初步的，预备的)，slack(松弛的)--lazy(懒惰的)，vaIueless(无价值的)--priceless(无价的)，vivid(生动的)--living(活的)，etc。例如:
    ①Henry's speech was so vivid that his audience applauded again and again.
    ②It is easier adapt to new situations if one has a flexible attitude.We have finished the preliminary exam .
    ③Your suggestion is priceless，and I will consider it carefully.
    3)有些词尾为-ly 的并非副词，而是形容词,如:lovely，likely，deadly，earthly(现世的)，leisudy(空闲的)，weekly，yearly，manly(丈夫气概的)，brotherly，friendly等。例如:
    ①What a lovely girl Jenny is always ready to help Others.
    ②China Daily is of course a daily newspaper but not a weekly one.He is a very friendly young man.As he didn't have any experience，he was likely to have problems.
    以下情况形容词常用于后置:1)形容词短语，即形容词十副词，介词短语或不定式。2)一些表语性形容词要后置，如:present，available，involved，concerned，etc。3)形容词修饰不定代词something，anything，everything 时要后置。例如:
    ①There was something nice about my feeling that she knew aIl.
    ②For this reason，as well as the additional cost involved，flow force compensation is generally not desirable.
    ③I came across another question hard to answer then.    ④I wondered if there was a room available.
    副词的位置为:修饰哪个词就放在哪个词前面;放在系动词和助动词之后，行为动词和分词之前。例如:
    ①I had a only five-dollar bill with me when I boarded the townward train.
    ②The old law were instituted to protect the long negleCted rlghts of children.
    ③I can hardly believe that he is the murderer.
    ④Although he has advantages，lt is still too early to say that he is sure to win.
    2.比较级与最高级的基本形式和用法
    形容词的比较级和最高级的构成为:单音节词一般在词尾加-er和-est。如果以-e结尾，仅加-r和-st;如末尾仅有一个辅音字母，须双写词尾再加-er和-est;如果以y 结尾的，把y 变i，加-er，-est;多音节单词和双音节词(其中包括由分词和分词演变而来的形容词，如:known，worn，wounded，shocking，striking，interesting，ect.则在其前加more和most;有些形容词的比较级和最高级是不规则的，如:good(well)-better-best，bad(ill)-worse-worst，many(much)-more-most，little-less-least，far-farthe(further)-farthest(furthest)。有些形容词没有比较级形式，如:absolute，chief，entire，eternal，excellent，fatal，final，foremost，inevitable，infinite，main，naked，perfect，possible，primary，right，sufficient，supreme，universal，utter，vital，whole，wooden，ect。例如:
    ①Mary is the best student in the class.    ②Further negotiation will be conducted next month.
    ③The food we have is sufficient.    ④Needless to say，he is stronger than his opponent.
    一般副词的比较级和最高级与形容词一样，单音节的以在词尾加-er和-est构成，多音节的以加more 和most的方法构成;有些比较特殊,如：well-better-best，badly-worse-worst，much-more-most，little-less-least。以-ly结尾的副词，在其前面加more，most。例如:
    ①Tony runs more than any other students in the class.   ②She get more income every month than her husband.
    ③Which do you like best，Thorn Birds，Gone With the wind or great expectation?    ④I prefer less sugar in the milk.
    形容词和副词的原级比较由“as +形容词或副词(或后跟名词或短语)+as”构成，“as-as“前可加not，just，almost，nearly，quite，twice，several times等词修饰。否定式中not后面的as可改为so。例如:”
    ①Henan Province is several times as large as shanghai.　　    ②Jimmy has as nervous a way of speaking as his father.
    ③Getting rid of a bad habit isn't so simple as taking it up.
    形容词相副词的比较级形式为:“形容词(副词)比较级+than+-”，应注意than前后相比较的人或物要一致。比较级前可以跟even ，much，still等副词修饰比较级，表示强调。例如:
    ①Mother worried much more about my younger brother than she did about me.  

②Sound travels faster through water than through air.
    ③The economic development in south China is faster than that in North China .    ④My books are much more than Li Ping's.
    形容词相副词的最高级的形式分别为:“the+形容词最高级+名词十范围表达”和“副词最高级十名词+范围表达”，副词的比较级和最高级不需要加the。例如:
    ①Our foreign exchange reserve didn't decline despite the worst flood in sixty years.
    ②I finished the work more successfully than he had expected.
    应注意以下表达式的含义:the same as(和……一样)，no less than(不少于)，not less than(只有)，had better(最好)，less than(不到)，more or less(或多或少)，other than(除了)，rather than(而不是)，the more…the more/less(越……就越……)例如:I am sure that the amount of money used in repaying a loan would have the  same value as the amount of money borrowed.
    ①You had better finish your homework today for the teacher will collect it tomorrow .
    ②We have received ten dozen of personal computers which are less than the amount we ordered.
    ③The visitors to the exhibition were not less than three hundred, which disappointed them very much.