YOU SAID:

I wanted to know if they sell hot dogs there

INTO JAPANESE

彼らがそこにホットドッグを売っているかどうか知りたかった

BACK INTO ENGLISH

I wanted to know if they were selling hot dogs there

INTO JAPANESE

私は彼らがそこにホットドッグを売っていたかどうか知りたかった

BACK INTO ENGLISH

I wanted to know if they were selling hot dogs there