YOU SAID:

I didn't know Pineapple soda was a thing

INTO JAPANESE

私はパイナップルソーダが物であることを知りませんでした

BACK INTO ENGLISH

I didn't know that pineapple soda was a thing

INTO JAPANESE

パイナップルソーダが物だとは知らなかった

BACK INTO ENGLISH

I didn't know that pineapple soda was a thing