1.一般在形容词的词尾加-ly可以变成副词.例如：quick—quickly,slow—slowly,loud—loudly,sudden—suddenly 等.
2.一些以“辅音字母+y”结尾的形容词,要把y改为i再加-ly.例如：happy—happily,angry—angrily,lucky—luckily,heavy—heavily,noisy—noisily 等.
3.有些以-ble或-le结尾的形容词,去掉e加-y.例如：possible—possibly,terrible—terribly等.
4.少数以e结尾的形容词,要去掉e再加-ly.例如：true—truly等.但绝大多数以e结尾的形容词仍然直接加-ly.例如：polite—politely,wide—widely等.