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.