1、一般情況下直接加“ly”，如：quick-quickly; polite-politely; sad-sadly; imediate-immediately; recent-recently.

2、少數以e結尾的形容詞，要去掉e再加-ly.如：true-truly; due-duly.絕大多數輔音字母加e結尾的形容詞直接加-ly.如：polite-politely; wide-widely; wise-wisely;nice-nicely.

3、以“y”結尾的，且讀音為 / i /，先將“y”改成“i”，再加“ly”，如：happy-happily; heavy-heavily; angry-angrily; busy-busily.但是如果讀音為 /ai/，直接加ly，如：dry-dryly; sly-slyly; shy---shyly.

4、以ic 結尾的詞，加ally，如：economic-economically; basic-basically; scientific-scientifically; automatic-automatically; energetic-energetically; 但是public-publicly 例外.

5、以輔音字母加le結尾時,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時加 ly，如：sole-solely。但是whole-wholly例外.

6、以-ll結尾時，只須加 –y，如：dull-dully; shrill-shrilly.

一、直接在形容詞末尾加ly 如：slowly

二、以輔音字母加y結尾的形容詞，變y為i，再加ly 如：heavily

三、以字母le結尾的形容詞，去掉ly，再加ly 如：terribly