1. 一般情况加ly。如：real→really; careful→carefully; polite→politely; quick→quickly
2. 以“辅音字母＋y”结尾的，将y改为i，再加ly。如：angry→angrily; busy→busily; heavy→heavily
3. 以ble结尾的，将ble改为bly。如：probable→probably; possible→possibly
4. 部分以“辅音字母＋e”结尾的词，去掉e再加ly。如：true→truly
5. 以ic结尾的，加ally。如：basic→basically；energetic→ energetically
