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.