YOU SAID:

I come here from 1985.

INTO JAPANESE

私は1985年からここに来ました。

BACK INTO ENGLISH

I've been here since 1985.

INTO JAPANESE

私は1985年以来ここにいます。

BACK INTO ENGLISH

I have been here since 1985.

INTO JAPANESE

私は1985年以来ここにいます。

BACK INTO ENGLISH

I have been here since 1985.