YOU SAID:

I think I left the dog in my car again.

INTO JAPANESE

もう一度は私の車で犬を残したと思います。

BACK INTO ENGLISH

I think I left the dog in my car once again.

INTO JAPANESE

私はもう一度は私の車で犬を残したと思います。

BACK INTO ENGLISH

I think I left the dog in my car once again.