YOU SAID:

there are two children in my basement

INTO JAPANESE

私の地下室には2人の子供がいます

BACK INTO ENGLISH

I have two children in my basement

INTO JAPANESE

地下室に2人の子供がいます

BACK INTO ENGLISH

There are two children in the basement

INTO JAPANESE

地下には二人の子供がいます

BACK INTO ENGLISH

There are two children in the basement