YOU SAID:
This cat is a small cat
INTO JAPANESE
この猫は小さな猫です。
BACK INTO ENGLISH
This cat is a small cat.
INTO JAPANESE
この猫は小さな猫であります。
BACK INTO ENGLISH
This cat is the small cat.
INTO JAPANESE
この猫は小さな猫であります。
BACK INTO ENGLISH
This cat is the small cat.
That didn't even make that much sense in English.