1、以 e 结尾的形容词变副词terrible-terribly; true-truly; gentle-gently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：一般直接加，“元 e”去 e 加，“辅 y”改 i 加，“le”结尾 e 改 y。分别举例如下：quick-quickly; true-truly; happy-happily; pssible-possibly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-recently2.
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-nicely3. 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-shyly4.以 ic 结尾的词，加 all
3、y，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-terriblygentle-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
