吃过早餐

have eaten breakfast

→ 吃
phrase Rare #30,854
have eaten breakfast 过 marks a past experience or completed action; in context, this often means that breakfast has already been eaten.
CH: 我吃过早餐了。
EN: I've eaten breakfast already.

玛丽吃过早餐了。

Mary has eaten breakfast.

在做礼拜之前你们两个吃过早餐吗?

Did you two have breakfast before praying?

— 惊魂记 (1960)

你吃过早餐没有?

Have you had breakfast yet?

— 无间道 (2002)

只吃过早餐

I’ve only had breakfast.

— 帝国的毁灭 (2004)