YOU SAID:

Where have my pants run off to?

INTO JAPANESE

私のパンツはどこへ行ってしまったのでしょうか？

BACK INTO ENGLISH

Where have my pants gone?

INTO JAPANESE

私のパンツはどこへ行ったのでしょうか？

BACK INTO ENGLISH

where did my pants go?

INTO JAPANESE

私のパンツはどこに行ったの？

BACK INTO ENGLISH

where did my pants go

INTO JAPANESE

私のパンツはどこへ行ったのか

BACK INTO ENGLISH

where did my pants go