副詞(adv.)修飾形容詞或動詞,形容詞(adj.)修飾名詞或者代詞.
副詞一般以ly結尾. 副詞在句中作狀語,一般靠近謂語動詞或者在句首或者句末.形容詞靠近所修飾的名詞或代詞，作定語.
建議你多讀英語課本，有意識的分析句子的結構,找出主.謂.賓. 相信你的外語會有明顯的提高的.
容易混淆的形容詞和副詞
形容詞用來修飾名詞；副詞用來修飾動詞、形容詞、其他副詞或整個句子。可是，有時形容詞和副詞容易混淆。例如「a fast train reached the destination fast」中的第乙個「fast」是形容詞，第二個就是副詞。
此外，有些詞既能是形容詞，也能是副詞，有些詞義不變，另些詞義不同；有些形容詞加上字尾「-ly」構成的副詞和原來的形容詞意思相近，但有一些意義則相差甚遠；更有些形容詞，除自己本身能兼而充當副詞之外，又可以再加上字尾「-ly」構成派生副詞，若不小心，容易引起混淆。
下面分別舉例說明：
⑴可作形容詞又可作副詞，詞義不同如：
①a. joelle is a pretty child.（形容詞）
b. tom will be back pretty soon.（副詞）
②a. the old man has been ill for some time.（形容詞）
b. don't speak ill of others.（副詞）
⑵既是形容詞，也是副詞，句子中的語法功能不同，但意義一樣，如：
③a. what a deep ocean it is !（深的）
b. the boy dug deep into the ground.（深）
④a. look at the high mountain!（高的）
b. birds fly high in the sky.（高）
⑶形容詞可以充當副詞，又可以加上字尾，構成派生副詞。在某些場合，兩者相近，可以通用（如例⑤和⑥）；在另一些場合裡，兩者意思有異，不可混為一談（如例⑦和⑧）：
⑤a. hold it tight, please!
b. hold it tightly, please!
⑥a. please read slower.
b. please read more slowly.
⑦a. john came late yesterday.（遲）
b. john has been working hard lately.（最近）
⑧a. jason works hard.（努力地）
b. susan hardly works.（幾乎不）
⑷有些形容詞或副詞，同時有多個意思，如：
⑨a. hard labour（苦工）
b. hard times（艱難時代）
⑩a. the baby is fast asleep.（睡得熟）
b. run fast, please!（ 請快跑）
c. hold the rope fast!（緊握繩索）
⑸同詞根的派生形容詞和形容詞及分詞間，意思雖甚接近，但容易引起混亂，如：
11a. the child is sleepy.（昏昏欲睡）
b. the child is still asleep.（還在睡眠中）
c. why are you looking at the sleeping child?（睡著的）
12a. diana feels lonely/ lonesome in the big house.（感到寂寞）
b. mary was alone in the office last night.（獨自）
13a. irene was awake the whole night last night.（整夜未眠）
b. tom had a wakeful night last night.（整夜未眠）
c. what did you do during your waking hours last night?（醒著的時刻）
(a)和(b)意思相近，但(a)的 awake 只能作補足語；(b)的 wakeful 則沒有這個侷限。(c)裡的waking 現在分詞和(a)及(b)的兩個形容詞也似同非同，不易隨意取代。
在英語中,某些形容詞詞形同時也可作副詞,但這些形容詞還有加字尾-ly 副詞的形式,因此這類詞就有兩種副詞形式，它們在用法上有些可以互換， 有些是有區別，下面筆者對這類詞做一總結。
一般地說，可以互換的這類詞，形容詞詞形的副詞表示比較具體的概念， 經常用語口語中，不太正式；字尾-ly形式的副詞，表示比較抽象的概念，有引申義，並有一定感**彩，變副詞比較級時，用此類副詞，如修飾動詞和分詞，放在它們前面。
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 (細微地） (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 h**e 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 h**en'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 (悅人地）
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 準時地
he arrived at six o'clock ~.
sharply: 銳利地，急劇地
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: 徹底地 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 tr**eled widely.
30) wrong used instead of wrongly in informal conversation.
you guessed wrong(ly)
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