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: precisely¹ in a clean manner, often used with v cut.
He caught the ball ~ . The doctor cut ~ through the abdominal² 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 humble³ 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)