That push-up I felt and my knee lifting it is what I've forgotten. I couldn't reproduce it myself so I had to feel it again.

那种向上推的力，我膝盖举起时的感觉，这一切我已经忘记多年了。我自己不能举起膝盖，所以不得不再次去感受它。

youdao

I've forgotten what the firm he works for is called.

我已经忘记他所在公司的名称。

《牛津词典》

Funnily enough I can remember what I had for lunch on July 5th, 1956, but I've forgotten what I had for breakfast today.

说来也怪，我能记得我1956年7月5日午餐吃的什么，却已忘了我今天早餐吃的什么。

《柯林斯英汉双解大词典》