当单词加上一个后缀时，其拼写通常发生变化或去掉字母。下面将帮助你记住这些变化。

ful Pattern:The　suffix　full is　always　spelled　with　one　在第一课学到的多音节词的结尾是

一个l，后缀ful组成的多音节词也是一个l： useful hopeful rightful peaceful

ly Pattern: When ly is　addedto a word　endingy, that y is changed to i. thirsty + ly =

thristily icy + ly = icily

Pattern: When ly is added toa word ending l, that l is kept. awful + ly = awfully natural +

ly = naturally Pattern: Whenly is added to a word ending ll, one l is dropped to avoid three

l? in a row. No English wordhas the same letter three times in a row. full + ly = fully shrill

+ ly = shrilly

gyPattern:When gy comes at the end of a word, the vowel before it is o. apology ecology

biology anthology例外：strategy 　 ify -- efy Pattern: The suffix ify is used to make verbs.

terrify verify notifyglorify 例外：liquefy rarefy putrefy stupefy 　

ity -- ety Pattern: The usual ending is ity. eguality severity similarity utility 例外： 1. ty is

added to a few words ending e. entire + ty = entirety safe + ty = safety naive + ty =

entirety　subtle + ty = subtlety nice + ty = nicety sure + ty = surety

2. ety is added to stems ending i in order to avoid two i?in a row. anxiety notoriety society

gaiety piety sobriety propriety variety

cy Pattern: When cy is added to a word ending t, the t is dropped. regent + cy = regency

idiot+ cy = idiocy decent + cy = decency 例外：bankruptcy 仅有六个英语单词有两个在一起的i，

常遇到的几个是： alibiing skiing taxiing 一般情况下，在英语中避免两个i在一起