形容词变副词通常是加ly,其变化有一定规律可循：1) .一般情况下直接加ly，如：quick-quickly; polite-politely; sad-sadly; immediate-immediately; recent-recently2). 少数以e结尾（ue）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-nicely3). 以辅音字母加y结尾的（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-shyly4).以ic 结尾的词，加ally，如：economic-economically; basic-basically; scientific-scientifically; automatic-automatically; energetic-energetically5).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; motherly care; lovely dog; monthly exam; heavenly peace; a manly sport