YOU SAID:

Are you sure they'll be here?

INTO JAPANESE

彼らがここにいると確信していますか？

BACK INTO ENGLISH

Are you sure they are here?

INTO JAPANESE

彼らがここにいるのは確かですか？

BACK INTO ENGLISH

Are they sure they are here?

INTO JAPANESE

彼らはここにいると確信していますか？

BACK INTO ENGLISH

Are you sure they are here?

INTO JAPANESE

彼らがここにいるのは確かですか？

BACK INTO ENGLISH

Are they sure they are here?

INTO JAPANESE

彼らはここにいると確信していますか？