YOU SAID:

I have never been to subway

INTO JAPANESE

地下鉄に行ったことがないです。

BACK INTO ENGLISH

Have been on the subway.

INTO JAPANESE

地下鉄の中でされています。

BACK INTO ENGLISH

Has been in the subway.

INTO JAPANESE

地下鉄でされています。

BACK INTO ENGLISH

Has been in the subway.