YOU SAID:

Well, I can't seem to find where I lost my pants

INTO JAPANESE

ズボンがなくなった場所が見当たらない

BACK INTO ENGLISH

I can't see where my pants are gone.

INTO JAPANESE

ズボンがどこにあるかわからない。

BACK INTO ENGLISH

I don't know where my pants are.

INTO JAPANESE

パンツがどこにあるかわからない。

BACK INTO ENGLISH

I don't know where the pants are.

INTO JAPANESE

パンツはどこにあるかわからない。

BACK INTO ENGLISH

I don't know where the pants are.