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.