YOU SAID:

But why do i have to go

INTO JAPANESE

でも、なぜ私が行かなければならないのですか

BACK INTO ENGLISH

But why should I go

INTO JAPANESE

でも、なぜ行かなければいけないのですか

BACK INTO ENGLISH

but why do i have to go

INTO JAPANESE

でもなぜ行かなければいけないのですか

BACK INTO ENGLISH

but why do i have to go