YOU SAID:

Look at the size of it, I had no idea these things were so big!

INTO JAPANESE

その大きさを見て、こんなに大きいなんて知らなかった！

BACK INTO ENGLISH

Looking at its size, I didn't know it was so big!

INTO JAPANESE

その大きさを見て、こんなに大きいとは知りませんでした！

BACK INTO ENGLISH

Looking at its size, I didn't know it was so big!