YOU SAID:

i've been to the store

INTO JAPANESE

私は店に行ったことがあります

BACK INTO ENGLISH

I have been to the store

INTO JAPANESE

私は、以前、そのお店に行った。

BACK INTO ENGLISH

I went to the store before.

INTO JAPANESE

私は、以前、そのお店に行った。

BACK INTO ENGLISH

I went to the store before.