sure变副词：surely
1.一般情况直接加―ly
quick---quickly
polite---politely
sad---sadly
2.少数以e结尾的形容词，先去掉e，再加-ly
true-truly
due-duly
3.大多数辅音字母加e结尾的形容词直接加-ly
polite-politely
wide-widely
wise-wisely
nice-nicely
4.以―个y结尾的，且读音为 / i /， 先将―y改成―i，再加―ly
happy---happily
heavy---heavily
angry---angrily
busy---busily
如果读音为 / ai /， 直接加ly
dry-dryly
shy-shyly
5.以辅音字母加le结尾时,去e加y
simple---simply
terrible---terribly
gentle---gently
possible---possibly
6.以-ll结尾时，只加 –y
dull---dully
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