YOU SAID:
I have many children in my basement
INTO JAPANESE
私の地下室にはたくさんの子供たちがいます
BACK INTO ENGLISH
There are many children in my basement
INTO JAPANESE
うちの地下室にはたくさんの子供たちがいる
BACK INTO ENGLISH
There are many children in my basement
You've done this before, haven't you.