YOU SAID:

I own 17 cats and they are all spies

INTO JAPANESE

私は17匹の猫を所有しており、それらはすべてスパイです

BACK INTO ENGLISH

I own 17 cats and they are all spies.

INTO JAPANESE

私は17匹の猫を飼っていて、それらはすべてスパイです。

BACK INTO ENGLISH

I have 17 cats, all of which are spies.

INTO JAPANESE

私は17匹の猫を飼っていますが、その全てがスパイです。

BACK INTO ENGLISH

I have 17 cats, all of which are spies.