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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.
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