YOU SAID:

I know where his drugs are but not my pants.

INTO JAPANESE

私は、彼の薬が私のズボンではないが、知っています。

BACK INTO ENGLISH

I, his medications in my pants is not know.

INTO JAPANESE

私は、私のズボンの彼の薬は分からない。

BACK INTO ENGLISH

I do not know my pants of his medication.

INTO JAPANESE

彼の薬物のズボンがわからない。

BACK INTO ENGLISH

You do not know the pants of his medication.

INTO JAPANESE

彼の薬物のズボンがわからない。

BACK INTO ENGLISH

You do not know the pants of his medication.