YOU SAID:

Why was that party so boring?

INTO JAPANESE

なぜその当事者が退屈だったので?

BACK INTO ENGLISH

So why the party was boring?

INTO JAPANESE

では、なぜパーティはつまらなかったですか?

BACK INTO ENGLISH

So, why the party was boring?

INTO JAPANESE

それでは、なぜパーティはつまらなかったですか?

BACK INTO ENGLISH

So, why the party was boring?