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。