YOU SAID:
There is a cat in my pants
INTO JAPANESE
私のズボンに猫があります。
BACK INTO ENGLISH
Have a cat in my pants.
INTO JAPANESE
猫が私のズボンであります。
BACK INTO ENGLISH
The cat is in my pants.
INTO JAPANESE
猫は私のズボンです。
BACK INTO ENGLISH
The cat is in my pants.
Come on, you can do better than that.