形容词变副词通常是加ly,其变化有规律可循,请记住以下口诀：
如下：quick---quickly; true---truly; happy---happily; possible----possibly
具体规则如下：1) .一般情况下直接加―ly，如：
quick---quickly; polite---politely; sad---sadly; immediate---immediately; recent---recently;real-really; helpful-helpfully; careful-carefully; hopeful-hopefully;
2). 少数以e结尾的形容词，要去掉e再加-ly。如：true-truly; due-duly
绝大多数辅音字母加e结尾的形容词直接加-ly。
如：polite-politely; wide-widely; wise-wisely; nice-nicely
3). 以―个y结尾的，且读音为 / i /， 先将―y改成―i，再加―ly，如：
happy---happily; heavy---heavily; angry---angrily; busy---busily
但是如果读音为 / ai /， 直接加ly，如：dry-dryly; sly-slyly; shy---shyly
4).以ic 结尾的词，加ally，如：
economic---economically; basic---basically; scientific---scientifically; automatic---automatically; energetic---energetically
5).以辅音字母加le结尾时,去e加y，如：
considerable---considerably; terrible---terribly; gentle---gently; possible---possibly; probable---probably; incredible---incredibly;comfortable-comfortably;reasonable-reasonably
元音字母加le时加 ly，如：sole-solely。但是whole-wholly例外。
6). 以-ll结尾时，只须加 –y，如：
dull---dully; shrill---shrilly
需注意: 有些以ly结尾的词是形容词而非副词。如：
friendly people; motherly care; lovely dog; monthly exam; heavenly peace; a manly sport
