二、名词变形容词类

1．在动词或名词后加后缀-ful, 如：

care→careful;  use→useful;    thank→thankful;            forget→forgetful

help→helpful;  beauty→beautiful;   wonder→wonderful   

2．在名词后加-y, 如：

luck→lucky,   cloud→cloudy;   wind→windy;             noise→noisy

rain→rainy;   sun→sunny,    snow→snowy;            health→healthy

3．在名词后加-y, 如：

friend→friendly  love→lovely   day→daily

4．方位名词加-ern，如：

east→eastern       west→western   south→southern            north→northern

6．在名词后加-less, 变成否定含义的形容词。如：

use→useless   hope→hopeless  care→careless

三、形容词加后缀变成名词

1．形容词加-ness变成名词，如：

happy→happiness  ill→illness   weak→weakness

kind→kindness  good→goodness  careless→carelessness

2．形容词加-ty变成名词，如：

safe→safety   difficult→difficulty

3．形容词加-th变成名词，如：

true→truth   warm→warmth  young→youth

4．形容词加-ence / ance变成名词，如：

important→importance dependent→dependence  different→difference