我曾经见过你母亲。

I once met your mother.

《牛津词典》

我曾经见过很多更复杂的例子。

I have seen many more complex examples in the wild.

youdao

我曾经见过那个老教授几次。

I have met the old professor on several occasions.

youdao

Listen, I have seen this person's work in these eight context and it's all been great. You know.

他说，我曾经见过这个人在八种环境下工作，而且工作质量都很高。

写推荐书的人 - SpeakingMax英语口语达人

Have you ever seen a face as attractive as mine?

你曾经见过像我这么吸引人的脸庞吗？

so that 实战 - SpeakingMax英语口语达人