They all looked(happily)at the teacher.为什么不用happy?

问题描述:

They all looked(happily)at the teacher.为什么不用happy?

他们都开心的看着老师!
happily, adv副词, 修饰行为动词, 如: looked, 开心的看着
Happy, adj形容词, 正常用来修饰be动词

They look happy.是说主语they看起来很高兴.这里的look的作用类似系动词,happy是形容词做表语.
此句是他们都高兴地看着老师.此句中look是实义动词,不是助动词,要用副词修饰它,而不用形容词.
请及时采纳,多谢!