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 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 三、某些以辅音字母加不发音的字母e结尾和以-ue结尾的形容词要先去掉e,然后再加-y或-ly。

如: terrible-terribly; true-truly; gentle-gently。