YOU SAID:

And what is it that needs to be replaced

INTO JAPANESE

そして、交換する必要があるのは何ですか?

BACK INTO ENGLISH

And what needs to be replaced?

INTO JAPANESE

そして、何を交換する必要がありますか?

BACK INTO ENGLISH

And what do I need to replace?

INTO JAPANESE

そして、私は何を交換する必要がありますか?

BACK INTO ENGLISH

And what do I need to replace?