YOU SAID:

there's a cat in my mouth

INTO JAPANESE

私の口の中に猫がいる

BACK INTO ENGLISH

There's a cat in my mouth.

INTO JAPANESE

私の口の中に猫がいます。

BACK INTO ENGLISH

There is a cat in my mouth.

INTO JAPANESE

私の口の中に猫がいます。

BACK INTO ENGLISH

There is a cat in my mouth.