a)–acious→–acity:如sagacious→sagacity
b)–ate(形容词)→–acy:如accurate→accuracy
c)–al(形容词)→-ality:如mental→mentality
d)–ance、-ancy、-ence、-ency→-ant、-ent:如excellence→excellent
e)-cracy→-crat→-cratic:如democracy→democrat→democratic
f)–fy→–faction:如satisfy→satifaction
g)-graphy→-graphic→-grapher:如geography→geographic→geographer
h)-ify→-ification:如certify→certification
i)–ic→-icity:如specific→specificity
j)-ical→-icality:如logical→logicality
j)–ise、-ize→-isation、-ization:如improvise→improvisation
k)–logy→-logical→-loger、-logist、-logian:对比astrology(astrological、astrologer)/geology(geological、geologist)/theology(theological、theologian)。
l)-nomy→-nomic→-nomer:如astronomy→astronomic→astronomer
熟悉了以上的规则,对提高英语拼写的准确程度很有帮助。除此之外,最重要的两条,一是注意自己的发音,发音准,又熟悉语音规则,拼写就容易准确;二是熟悉英语构词法,多学一些词根、词缀,了解构词规律。