YOU SAID:

there is a castle inside a house

INTO JAPANESE

家の中に城がある

BACK INTO ENGLISH

There's a castle in the house.

INTO JAPANESE

家の中に城がある。

BACK INTO ENGLISH

There is a castle in the house.

INTO JAPANESE

家には城がある。

BACK INTO ENGLISH

The house has a castle.

INTO JAPANESE

その家には城がある。

BACK INTO ENGLISH

The house has a castle.