形容詞變副詞的規則：
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.但絕大多數以e結尾的形容詞仍然直接加-ly.例如：polite—politely,wide—widely等.
5.以-ll結尾時，只須加–y，如：dull-dully;shrill-shrilly.
6.以ic結尾的詞，加ally，如：economic-economically經濟上地; basic-basically基本上; scientific-scientifically科學的; energetic-energetically精力充沛地; 但是public-publicly公開地例外。