3岁男孩讲英语可以用 "a 3-year-old boy speaking Engpsh" 来表示。
"A 3-year-old boy" 是指一个年龄为3岁的男孩，"speaking" 是谓语动词，表示正在说话，"Engpsh" 则表示男孩正在讲的语言是英语。
这是英文中常用的表达方式。
下面是一些相关的英文例句及其中文翻译：
"My son is a 3-year-old boy speaking Engpsh fluently." 我儿子是一个3岁的男孩，英语流利。
"I'm impressed by the language skills of that 3-year-old boy speaking Engpsh." 我对那个3岁男孩的英语能力印象深刻。
"The 3-year-old boy speaking Engpsh in the video is so cute." 视频中讲英语的3岁男孩太可爱了。
"A 3-year-old boy" 是指一个年龄为3岁的男孩，"speaking" 是谓语动词，表示正在说话，"Engpsh" 则表示男孩正在讲的语言是英语。
这是英文中常用的表达方式。
下面是一些相关的英文例句及其中文翻译：
"My son is a 3-year-old boy speaking Engpsh fluently." 我儿子是一个3岁的男孩，英语流利。
"I'm impressed by the language skills of that 3-year-old boy speaking Engpsh." 我对那个3岁男孩的英语能力印象深刻。
"The 3-year-old boy speaking Engpsh in the video is so cute." 视频中讲英语的3岁男孩太可爱了。