YOU SAID:

if i would then why would i want to.

INTO JAPANESE

もしそうなら、なぜ私はしたいのだろう。

BACK INTO ENGLISH

If so, why would I want to do it?

INTO JAPANESE

もしそうなら、なぜ私はそれをしたいのですか？

BACK INTO ENGLISH

If so, why would I want to do that?

INTO JAPANESE

どうしてなの？

BACK INTO ENGLISH

- Why would he do that?

INTO JAPANESE

- なぜそうする？

BACK INTO ENGLISH

- Why would he do that?