His parents and he walked home quietly,without saying anything
when his parents and he walked home quietly,they didn't say anything
上一句是非谓语形式
下一句是还原成状语从句,其实就是解释了为什么用非谓语可题目是His parents and he walked home ____ ________.with silence非要只有两个格子的话，就是用介词短语，他们闷声不响的回家了