形容词变副词的规则：
一、在形容词词尾直接加-ly。如:real-really; helpful-helpfully;
careful-carefully; hopeful-hopefully; slow-slowly;
quick-quickly; quiet-quietly polite-politely, wide-widely 二、以辅音字母加y结尾的形容词要变y为i，然后再加-ly。
如:busy-busily; angry-angrily; easy-easily happy-happily heavy-heavily noisy----noisily ；healthy----healthily naughty, pretty ,thirsty ,lazy,
三、以-ue结尾的形容词要先去掉e，然后再加-y：如:
true-truly；
四、以le 结尾的形容词，去e 加y 变成副词：
terrible-terribly;; gentle-gently possible-possibly probable—probably; responsible—responsibly ;
comfortable----comfortably
gentle----gently simple----simply
capable有能力的simple简单的gentle温柔enjoyable 快乐的
fashionable 时髦的enjoyable 快乐的comfortable 舒服的,
舒适的
lovable 可爱的washable 可洗的，耐洗的suitable 适当的，相
配的
lovable 可爱的suitable 适当的，相配的
五、另外，副词还可以由形容词加前缀a-得来，如:loud (adj.)-aloud (adv.)
注意：
1.多音节y结尾的词将y改为i后加ly
easy-easily happy-happily heavy-heavily
2.单音节y结尾的词直接加ly
gay-gayly (gaily) ；sly-slyly (slily)
3.以ll结尾的词只加y full-fully加 的意思
4.以ic结尾的词加ally
automatic-automatically ；energetic-energetically
5.其他形容词均加ly careful-carefully ；glad-gladly
6.本身既是形容词也是副词，无需改变
fast----fast early----early high----high hard----hard late----late far----far wide----wide alone----alone、7.虽然以ly结尾，但却是形容词，不能直接用来修饰动词
friendly lively lovely lonely likely
8.有些形容词本身即为副词，同时也有加ly的副词形式。但加不加ly意思不一样，使用时需注意
wide(形容词，宽阔的，睁大的)----wide(副词，睁大地)/widely(副词，广泛地)
high(形容词，高的)----high(副词，高地)/highly(副词，高度地)
hard副词容易写成hardly, hardly意思为“几乎不”，与hard 无任何关系
9..形容词变副词通常是加ly，其变化有规律可循，请记住以下口诀：
一般直接加，“元e”去e加，“辅y”改i加，“le”结尾e改y。分别举例如下：quick—quickly, true—truly, happy—happily, possible—possibly.