YOU SAID:

have you seen my son he has been missing for years

INTO JAPANESE

彼は長年行方不明になっている息子を見たことがあります。

BACK INTO ENGLISH

He looked at my son for many years been missing in that.

INTO JAPANESE

彼はで行方不明になって何年も私の息子を見た。

BACK INTO ENGLISH

He was missing and saw my son many years.

INTO JAPANESE

彼は行方不明になったし、多くの年の私の息子を見た。

BACK INTO ENGLISH

I saw many years of my son, and he went missing.

INTO JAPANESE

私は私の息子の多くの年を見て、行方不明となった。

BACK INTO ENGLISH

I look at my son for many years, became missing.

INTO JAPANESE

私は長年にわたって私の息子を見て、行方不明になった。

BACK INTO ENGLISH

I look at my son for many years, went missing.

INTO JAPANESE

私は長年にわたって私の息子を見て、行方不明になった。

BACK INTO ENGLISH

I look at my son for many years, went missing.