过了
guò le
Using "guo" with "le"
过了 says the thing has been done — recently, and it's off the list.
Verb + 过 + 了
How it works
她吃过了 — she's eaten (so don't wait for her). This isn't the life-experience 过; it's about a task already taken care of.
The 了 is the change-of-state one: the situation is now different from before.
It's the natural reply to 你吃饭了吗? when the answer is a relaxed "yep, already done".
Examples
tā chī guò le
她吃过了。
She's already eaten.
yào wǒ chī guò le
药我吃过了。
I've taken the medicine.
zhè ge wèn tí wǒ men tǎo lùn guò le
这个问题我们讨论过了。
We've already discussed this.