我想不起来以前曾经见过她。

I can't recall meeting her before.

《牛津词典》

我偶然看见一本我以前曾经读过的书。

I came across a book I used to read.

youdao

我以前曾经见到过他。

I have seen him before.

《新英汉大辞典》

There's historical scholarship that used to argue that a couple of generations ago, but not anymore.

几代以前有些历史学者曾经持这种观点,但现在没有了

耶鲁公开课 - 美国内战与重建课程节选

because Manchester used to be industrial place in old times.

因为在以前，曼彻斯特曾经是工业区。

伦敦生活的优缺点 - SpeakingMax英语口语达人

I used to live in London, so I've been before.

我曾经住在伦敦，所以，我以前来过。

科芬园的氛围 - SpeakingMax英语口语达人