1.一般在形容詞的詞尾加-ly可以變成副詞.例如：quick—quickly,slow—slowly,loud—loudly,sudden—suddenly 等.
2.一些以“輔音字母+y”結尾的形容詞,要把y改為i再加-ly.例如：happy—happily,angry—angrily,lucky—luckily,heavy—heavily,noisy—noisily 等.
3.有些以-ble或-le結尾的形容詞,去掉e加-y.例如：possible—possibly,terrible—terribly等.
4.少數(shù)以e結尾的形容詞,要去掉e再加-ly.例如：true—truly等.但絕大多數(shù)以e結尾的形容詞仍然直接加-ly.例如：polite—politely,wide—widely等.