YOU SAID:
I went to the supermarket and saw my mom opening a banana
INTO JAPANESE
私はスーパーマーケットに行き、お母さんがバナナを開くのを見た
BACK INTO ENGLISH
I went to the supermarket and saw my mom open the banana.
INTO JAPANESE
私はスーパーに行き、お母さんがバナナを開けるのを見ました。
BACK INTO ENGLISH
I went to the supermarket and saw my mom open the banana.
Well done, yes, well done!