在英语中，"早饭"通常被称作"breakfast"。

"Have"是英语中的助动词，意思是"已经有"或"吃了"。因此，"早饭吃了"可以用"have had breakfast"来表示。

来源：

"Breakfast"是英语中的一个复合词，由两个单词"break"和"fast"组成。"Break"在这里的意思是"打破"或"中断"，而"fast"是指"禁食"。因此，"breakfast"原意为"打破禁食"或"结束禁食"。

例句：

I had breakfast at 7 o'clock this morning. (我今天早上7点吃了早饭。)
Have you had breakfast yet? (你早饭吃了吗？)
She always has a big breakfast before going to work. (她上班前总是吃一顿丰盛的早饭。)
I usually have a bowl of oatmeal for breakfast. (我通常早饭吃一碗燕麦。)