网友的问题，实际涉及同源形容词及其区别的问题。我想，只是把它们罗列出来，似乎还远远不能满足网友的需要。我觉得，应该把它们之间的区别告诉网友，才是上策。

英语同源形容词的区别（用实例）：

在英语中某些词有两种或两种以上的形容词形式，它们词形相近，但词义不同，容易用错，下面对这类形容词做一总结。

1)historic: famous in history, 历史上著名的 associated with past times 与过去时代有关的

    a ~ event/speech/spot

historical: belong to history 历史上的

    a ~ people/novel/play/film/painting

    ~ trend

2) electric: worked by, changed with， producing electricity 用电的，带电的, 有电的

    ~ current/cable

electrical: relating to electricity, an idea of a less close connection with electricity

    ~ engineering/apparatus

3) economic: of economics

    ~ policy/geography/crisis/crops

economical: careful in the spending of money and time, not waste 经济的，节俭的

    an ~ housewife/store

4) industrial: of industries 工业的

    the ~ revolution/products/system

industrious: hard-working, diligent

    ~ people

5) considerable: great much 相当多（大）的

    a ~ income/distance

considerate: thoughtful 体谅的， 体贴的 周到的

    She is ~ to others.

6) sensible: reasonable, having good sense 实用的， 明知的

    a ~ woman/idea/ 豁达的妇女/明知的观点

    ~ clothes 实用的衣服

  sensitive: quick to receive impression 敏感的

    a ~ skin 

    ~ paper 感光纸

7) continual: going on all the time without stopping or with only short breaks, stop and go repeatedly, 连续的，断断续续的

    ~ rain/noise

continuous: going on without a break, an uninterrupted flow 连续不断的

    ~ fight/work

8) intense: high in degree 强烈的， 剧烈的，高度的

    ~ heat炽热/pain

    an ~ lady 热情的女子

intensive: deep and thorough 精深的， 集中的

    ~ reading/study彻底研究/agriculture密集农业

9） respectable: deserving respect, 值得尊敬的，有名望的

    a ~ man/profession

respectful: showing respect 尊敬人的，有礼貌的，

    He is always ~to the elders.

respective: belongs to each of these 分别的，各自的

    They sat on their ~ chairs.

10) imaginable: that can be imagined 可象想的

    ~ difficulties

imaginary: existing only in the mind, unreal 想象中的， 不真实的

    ~ figure 

imaginative: of, having, using imagination 有想象力的， 运用想象力的

    a ~ writer

11) intelligent: having, showing intelligence, clever 有才智的, 聪明的

     an ~ looking girl    ~ answer

intelligible: clear to mind, that can be easily understood. 易了解的, 易领悟的

    an ~ speech/explanation

intellectual: possessing a great deal of knowledge 知识的, 智力的

12) contemptible: deserving contempt 可卑的

    a ~ lie

contemptuous: showing contempt 表示轻视的

    a ~ look

13) credible: that can be believed 可信的， 可靠的

    a ~ witness

credulous: too ready to believe things. 轻易相信的， 易上当的

    He always cheats ~ people.

creditable: that brings credit. 可称赞的

    a ~ record/deed/effort

14) alternate: changing by turns 轮流的， 交替的

alternative: giving a choice between two things 选择的， 两者选一的

15) comparable 可比较的， 有类似之处的

comparative 比较而言的， 相当的

There is no scenery comparable to that of the West lake.

He lived in comparative comfort recently.

16) politic 精明的

political 政治的

17) beneficial 有益的

beneficent 多多行善的

18) official 官方的

officious 多管闲事的

19) potent 强有力的

potential 潜在的， 可能的

20) confident 有信心的， 自信的

confidential 机密的

21) negligent 忽视的， 粗心大意的

negligible 可忽视的

22) momentary 瞬时的， 短时的

momentous 重大的

23) memorable 值得记忆的， 不能忘却的

memorial 纪念的

24) social 社会的

sociable 善社交的

 25) childish 幼稚的

childlike 孩子般的

26) distinct: clear 明显的， 清晰的

distinctive: characteristic 独特的， 有区别的

27) classic 一流的

classical 古典的

28) comprehensible 可理解的

comprehensive 全面的， 综合的

29) disinterested 公平的

uninterested 冷淡的

30) earthly 人间的， 尘世的

earthy 泥土似的

31) effective 有效的

efficient 有效率的

effectual 奏效的

32) exceptionable 反对的

exceptional 非凡的

33) fatal 致命的

fateful 决定性的

34) fleshly 肉体的

fleshy 肥胖的

35) homely 家常的

homelike 象家的

36) im(un)practical 不切合实际的

impracticable 无法使用的

37) ingenious 有独创性的

ingenuous 直率的， 天真的

38) manly 男人气派的

male 男的

masculine 男性的

39) movable 可移动的， 变动的

mobile 可动的，活动地 

40) mysterious 神秘的

mystical 奥妙的

41) notable 著名的（指事）

noted 著名的（指人）

42) Practical 实际的

practicable 可行的， 通行的

43) regretful 遗憾的 (指人）

regrettable 遗憾的 （指事）

44) seasonable 及时的

seasonal 季节的

45) spiritual 精神的

spirituous 酒精的

46) tortuous 弯曲的

torturous 受刑的

47) transitory 短时间的 （指事）

transient 瞬时的 （指人）

48) elementary 基本的

elemental 自然的

49) healthy 健康的

healthful 有易于健康的

50) likely 可能的

likable 可爱的

51) desirable 合意的

desirous 渴望的

52)clean 干净的

cleanly 有干净习惯的  Are cats cleanly animals?

53) kind 慈善地

kindly 友好的，亲切的

54) temporal 一时的, 暂时的, 世俗的

temporary  暂时的, 临时的

英语同源副词的区别

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，下面对这类词做一总结。

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)