YOU SAID:
the red fox jumped over the lazy dog.
INTO JAPANESE
赤いキツネが怠惰な犬を飛び越えた。
BACK INTO ENGLISH
The red fox jumped over the lazy dog.
INTO JAPANESE
赤いキツネは怠惰な犬を飛び越えた。
BACK INTO ENGLISH
The red fox jumped over the lazy dog.
That didn't even make that much sense in English.