YOU SAID:

He wore the longest pair of pants I had ever seen.

INTO JAPANESE

彼は私が今まで見たことのある最も長いペアのズボンを着ました。

BACK INTO ENGLISH

He wore the longest pair of pants that I have ever seen.

INTO JAPANESE

彼は私が今まで見たことのある最長のパンツを着ました。

BACK INTO ENGLISH

He wore the pants the longest that I have ever seen.

INTO JAPANESE

彼は最長のズボンを着ていた私がこれまで見た。

BACK INTO ENGLISH

He was wearing pants the longest I ever seen.

INTO JAPANESE

彼は着ていた私が今まで見た中でパンツが最長。

BACK INTO ENGLISH

He wore I have ever seen is the longest pants.

INTO JAPANESE

彼が着ていた最長のパンツは、今まで見た。

BACK INTO ENGLISH

The longest he was wearing pants, ever seen.

INTO JAPANESE

最長彼は見たのズボンを着ていた。

BACK INTO ENGLISH

Up he was wearing pants that I saw.

INTO JAPANESE

まで、彼は見たのズボンを着ていた。

BACK INTO ENGLISH

Until he was wearing pants that I saw.

INTO JAPANESE

まで、彼は私を見たズボンを着ていた。

BACK INTO ENGLISH

Until he was wearing trousers looked at me.

INTO JAPANESE

まで、彼は私を見てのズボンを着ていた。

BACK INTO ENGLISH

Until he was wearing trousers looked at me.