in- inexperience inconvenience inequality
inability inexpensive inactive informal invisible indirect incorrect inaccurate（不准确的）
un- unwilling unfamiliar unimportant unpleasant unable untrue unfinished（未完成的）undoubted （无疑的） unbalane existence violence consequence independence competence intelligence insistence
-th growth strength truth youth -ship partnership ownership friendship scholarship relationship leadership --ology ecology biology psychology futurology
geology(地质学） -tizen Netizen citizen -proof waterproof windproof -hood意为：时期（status；etc．）例词：boyhood ，childhood，manhood, neibourhood
5. 常见否定前缀：
dis-disagreement dishonest dislike disappear disorder discourage dishonorable（不光彩的）
-er taxpayer typewriter/cooker/air-conditioner
container dresser carrier laughter shower thriller sticker(贴画） receiver(电话听筒）注意：guide(向导） cheat(骗子）judge(法官,裁判，评委） cook（厨师）
straight late hard
late/lately hard/hardly close/closely wide/widely deep/deeply
most/mostly
2. 常见名词后缀：-ness -ment -tion -ity -ant ence -ance -er -or -ist -ant -hood -ship -ology -tizen -ness sadness homelessness carelessness hopelessness -ment basement unemployment excitement disappointment amazement encouragement assessment appointment -ity ability possibility -tion satisfaction urbanization industrialization modernization liberalization -ance attendance acceptance guidance insurance annoyance assistance
-ant consultant assistant participant
-ist cyclist receptionist specialist violinist physicist 物理学家， journalist新闻记者，dentist 牙 医， instrumentalist乐器演奏家/ 乐器家， -ian historian 历史学家 ， technician技术员， 技师， vegetarian 食素者 magician
-or instructor actor translator creator calculator
sponsor director sailor
-ar lie-liar beg-beggar burglar grammar -ee referee employee examinee 参加考试者、受试 人(被监考者） interviewee
3. 常见副词后缀： -ly -ward -ly simply possibly truly ( 去e) / immediately closely accurately fortunately increasingly -ward eastward forward backward downward(s) afterwards -way sideways midways 4. 常见动词后缀：-en -fy --en lessen worsen deepen sharpen strengthen weaken shorten lengthen widen darken brighten ripen -ize意为：使……，变得……modernize，popularize ，legalize，hospitalize，symbolize -fy beatify simplify classify clarify -er lower(降低）
高中英语常用的派生词
-ly lonely lively lovely costly elderly
deadly ugly silly likely brotherly manly
friendly timely 注意：early daily weekly monthly yearly 既是 形容词也是副词
im- impatient improper impossible
ir- irregular il- illegal illiterate（文盲的，无文化的）illogical（ 不合逻辑的） non-加在形容词，名词前 non-existence（不存在） ，non-essential（不主要的），non-electrical（非电