1.名词词尾后加-ly,变成形容词, 如manly,friendly,brotherly, orderly...
2.形容词词尾加-ly,变成副词,如carefully,quietly,shamely...
3.动词词尾加-ly,变成形容词,如seemly
4.动词的过去分词加-ly,变成形容词,如repeatedly,unexpectedly,excitedly...
加-ly的规则:
a.一般情况下直接加“ly”
b.少数以e结尾的形容词,要去掉e再加-ly, 如,true-truly
c.以“y”结尾的,先将“y”改成“i”,再加“ly”,如happy---happily
d.大多数以e结尾的形容词仍然直接加-ly。例如:polite-politely, wide-widely
以上只是皮毛,要学习需要找专业的语法书籍来系统的学,你说是吧?