YOU SAID:

did you know that I've eaten tea at a tea party before.

INTO JAPANESE

私は以前にティーパーティーでお茶を食べたことを知っていましたか。

BACK INTO ENGLISH

Did I know that I had tea at a tea party before?

INTO JAPANESE

私は以前にティーパーティーでお茶を飲んだことを知っていましたか？

BACK INTO ENGLISH

Did I know that I had tea at a tea party before?