YOU SAID:

i have 30 children chained in my basement

INTO JAPANESE

私は地下に30人の子供が鎖でつながれています

BACK INTO ENGLISH

I have 30 children chained underground

INTO JAPANESE

地下に鎖でつながれた30人の子供がいます

BACK INTO ENGLISH

There are 30 children chained underground

INTO JAPANESE

地下に鎖でつながれた30人の子供がいます

BACK INTO ENGLISH

There are 30 children chained underground