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。

（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.