具体规则如下：
1.一般情况下直接加“ly”，如：
quick-quickly; polite-politely; sad-sadly; imediate-immediately; recent-recently
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“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;但是public-publicly 例外。
5.以辅音字母加le结尾时,去e加y，如：
simple-simply; considerable-considerably; terrible-terribly
gentle-gently; possible-possibly; probable-probably; incredible-incredibly
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; motherlycare; lovely dog; monthlyexam; heavenly peace; amanlysport