后 缀 

-er“人”

teachteacher

playplayer

cleancleaner

drivedriver

(以e结尾，-r)

runrunner

(重读闭音节，双写-er)

winwinner

traveltraveller

-or“人”

inventinventor

visitvisitor

-ly(副词后缀)

badbadly /quickquickly

carefulcarefully /happyhappily

deepdeeply /luckyluckily

usualusually noisynoisily

slowslowly /angryangrily

strongstrongly /quietquietly

特例：

truetruly

terribleterribly

possiblepossibly

-ful(形容词后缀)

carecareful

helphelpful

useuseful

forgetforgetful

-y(形容词后缀)

rainrainy

lucklucky

cloudcloudy

noisenoisy

(以e结尾，去e，加-y)

snowsnowy

sunsunny

(双写，加-y)

windwindy

-ion(名词后缀)

inventinvention

operateoperation

-ness(名词后缀)

busybusiness

goodgoodness

一些特例：

动词---形容词

sleepasleep

diedead

enjoyenjoyable

动词---现在分词转化为名词

boat boating

build building

begin beginning

cross crossing

meet meeting

turnturning

名词---形容词

friend friendly

south southern

wool woolen

dangerdangerous

difference different

fry fried

worry worried

动词---过去分词转为形容词

break broken

loselostpleasepleased

colourcoloured

动词---名词

know knowledge

flyflight

pleasepleasure

名词---名词

farmfarmer农夫

动词---现在分词、过去分词转为形容词

followfollowing

interestinterested“感兴趣的”只作表语，

仅用于beinterestedin

interesting“有趣的”

可作表语 和定语

developdeveloped“发达的”

developing“发展中的”