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.