High既可做形容词也可做副词,Highly只能做副词.
前者形容词义“高的”.
副词状态,前者“高高地”,后者是程度意义的“相当”.
如Highly interesting（相当有趣）,put it high（把它放在高处）
Carefully和Careful是单纯副词和形容词的区别- -小心翼翼地和小心的0 0
You can't be careful enough.越小心越好.
It isn't high enough.(adj.)还不够高!
Put it high enough to object the cats.(adv.)放得高些,防止猫儿碰吧.
总之,enough修饰形容词副词时都是在后面就是了.