你的分析都是对的关于时间状语yseterday.因为状语是对句子的补充说明,那么不要的话只是意思不全,对吧.那省略when his father came yesterday--->He was doing hie homework,无歧义.省略when his father came ---->He...没听懂 时间状语也有说修饰什么的吗？不是修饰句子的吗那这里上面yesterday修饰什么吖就是修饰 came所联系的 his father came 这句而不是He was doing his homework .因为He was doing hie homework yesterday.(他昨天一整天都在做作业？)不合逻辑。“修饰”不要狭义的理解 应理解为和其相关的词语 句子 。其实我也不是很懂 你看着办吧你能想到这个问题 挺佩服你的。