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,如daily,weekly,monthly,yearly,early等。例如:
The Times is a weekly paper. 《时代周刊》为周刊。
The Times is published weekly. 《时代周刊》每周发行一期。