they looked happy和they looked happyily那个是对的?为什么?

They looked happy.是说他们看起来很高兴.happy 是形容词.
His dog always looks （happily） at him when he gets home from school every day.
也是对的.因为这里 这里 happily 是副词修饰 looks at ..看着.
他每天一回到家他的狗就很开心的看着他.
这里happily 也可以换些位置,比如.
His dog always looks at him happily when he gets home from school every day.

they looked happy意思是他们看起来快乐。说的透彻一点，意思是他们看起来一副快乐的样子
they looked happyily意思是他们快乐地观看。
意思不同，用的时候要根据语境

标题的happyily是没有这个单词的喔,是happily～
应该是别人说错了,
happily是副词，要用副词修饰动词
happy是形容词，用形容词修饰名词
文章中用happily修饰前面的looks
所以不能用happy喔～

动词后面跟副词嘛~哪有跟形容词的~

hey looked happy:他们看上去很高兴，happy是系动词look的表语，表示看上去处于一种什么状态。
they looked happyily：他们 兴高采烈地看着，happily副词，修饰look看这个动作，高兴的看，兴高采烈的看。