1） 大部分形容词加-ly可构成副词。但 friendly，deadly，lovely，lonely，likely，lively，ugly，brotherly，仍为形容词。
　　改错：(错） She sang lovely.
　　（错） He spoke to me very friendly.
　　（对） Her singing was lovely.
　　（对） He spoke to me in a very friendly way.
　　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.