1）friendly，deadly，lovely，lonely，likely，lively，ugly，brotherly，仍为形容词。
2）有些以-ly 结尾既为形容词，也为副词。
daily，weekly，monthly，yearly，early
The Times is a daily paper. The Times is published daily.
加 ly 变副词，但有些单词以 ly 结尾，长得像副词，却是形容词。
costly = cost + lya costly item.一件昂贵的物品。
lovely = love + lyShe had a lovely face.她有一张漂亮的脸蛋。
