YOU SAID:

I have a big cat it has a black sveater.

INTO JAPANESE

私は大きな猫を飼っています。黒い猫がいます。

BACK INTO ENGLISH

I have a big cat. I have a black cat.

INTO JAPANESE

私は大きな猫を飼っています。私は黒猫を飼っています。

BACK INTO ENGLISH

I have a big cat. I have a black cat.