YOU SAID:
I saw someone steal a dog at the park today
INTO JAPANESE
今日誰かが公園で犬を盗むのを見た
BACK INTO ENGLISH
I saw someone steal a dog in the park today.
INTO JAPANESE
今日誰かが公園で犬を盗むのを見た。
BACK INTO ENGLISH
I saw someone stealing a dog in the park today.
INTO JAPANESE
今日誰かが公園で犬を盗んでいるのを見た。
BACK INTO ENGLISH
I saw someone stealing a dog in the park today.
You've done this before, haven't you.