在英语中,某些形容词词形同时也可作副词,但这些形容词还有加后缀-ly 副词的形式,因此这类词就有两种副词形式，它们在用法上有些可以互换，有些是有区别。

    一般地说，可以互换的这类词，形容词词形的副词表示比较具体的概念，经常用语口语中，不太正式；后缀-ly形式的副词，表示比较抽象的概念，有引申义，并有一定感情色彩，变副词比较级时，用此类副词，如修饰动词和分词，放在它们前面。

    1) cheap: often used instead of cheaply, esp. in casual conversation and with

    verbs like buy and sell

    Do you like this shirt? I bought it really cheaply.

    cheaply I can't sell you more cheaply.

    2) clean: completely, used with (1) verb forget (2) the proposition over,

    through (3) adv away out

    I ~ forget. The ball sailed ~ over the roof.

    The prisoner got ~ away. I am afraid I am clean out of food.

    cleanly: precisely in a clean manner, often used with v cut.

    He caught the ball ~ . The doctor cut ~ through the abdominal wall.

    3) clear: not touching

    Please stand clear of the gate.

    clearly: distinctly, obviously, similar to the meaning of clear

    I can't see ~ without my glasses.

    We ~need to think again.

    4) close: near

    Come close, I want to tell you something.

    closely: carefully, with great attention

    Study this ~ it's very important.

    5) dead: exactly completely, used in certain expressions

    ~ right, ~ sure, ` tired, ~ slow, ~ ahead, ~ drunk, ~ straight

    deadly: fatally

    He was ~ injured in the crash.

    6) direct: used instead of directly in talking about journeys and timetables

    The plane goes ~ from London to Houston.

    7) easy: used in certain expressions

    Take it easy. easy come, easy go.

    Easier said than done.

    easily I can do very easily.

    8) fair: used in the expression play ~, fight ~

    fairly: justly, honestly

    You must do it .
9) fine: well, used in some expressions

    That suits me fine. You are doing ~.

    finely: elaborately (细微地） (not commonly used

    He studied it very finely.

    10) free: without payment

    You can't eat ~ in my restaurant.

    freely: without limit or restriction(限制）

    You can't speak ~ in front of my father.

    11) hard: to show degree

    He hit hard.

    hardly: almost not

    12) high it refers to high position.

    Don't go higher. It is dangerous.

    highly: it refers to an extreme degree "very much".

    She is ~ paid. It is ~ amusing.

    13) just: a moment ago I have just come here.

    justly: in accordance with justice or the law.

    You must do it justly.

    14) late: not on time He hates arriving late.

    lately: recently I haven't heard from you lately.

    15) loud: used instead of loudly in informal conversation with the verbs talk,

    speak, shout, laugh

    loudly: in a big voice They quarreled ~.

    16) low: in a small voice

    Can you speak low?

    lowly: in a humble way

    Don't speak to him lowly.

    17) most: very Which do you like most?

    mostly: mainly, most often, in most cases

    18) pretty: rather ~ well, ~ soon

    prettily: pleasing to people (悦人地）

    He danced ~.

    19) quick: in informal English used instead of quickly

    quickly He acted ~.

    20) real in informal English used instead of really

    really Are you ~ tell me the truth.
21) right: just, exactly, all the way

    The ball hit me ~ in the nose.

    He arrived ~ after breakfast.

    Turn right at the traffic lights.

    rightly: correctly right can be used informally instead of rightly

    You guessed right(ly)

    22) sharp: punctually 准时地

    He arrived at six o'clock ~.

    sharply: 锐利地，急剧地

    look ~ speak ~

    23) short: suddenly

    The car stopped suddenly.

    shortly: soon He will come shortly.

    24) slow used in informal conversation instead of slowly

    go ~, drive ~

    25) sound: 彻底地 used in the expression sound asleep

    soundly: 非常好地 He is sleeping soundly.

    26) straight and straightly used in the same way.

    27) sure: used in American English meaning certainly

    surely: He speaks very surely.

    28) tight: used instead of tightly in informal conversation.

    hold ~, pack ~. The door was shut ~.

    tightly: We'd better sit tightly.

    29)wide: He opened his eyes wide.

    widely: in many different places

    He has traveled widely.

    30) wrong used instead of wrongly in informal conversation.

    You guessed wrong(ly)