聞いた事

what was heard; have heard

→ 聞く
phrase Uncommon #11,497
what was heard; have heard 聞いた事 can mean “what was heard.” In the pattern 聞いた事がある, it means “have heard” or “have heard before.” 事 is often written こと in this usage.
JA: その話は前にも聞いた事がある。
EN: I've heard that story before.

聞いた事

What have you heard?

— 灼熱の魂 (2010)

これまでそんな話聞いた事も無い

I've never heard anything like that before.

彼の歌を聞いた事がある

Have you ever heard him sing?

そんなの聞いた事ないだろう

You've never heard of that, have you?

— オデッセイ (2015)

聞いた事はある

I've heard of it.

— ア・フュー・グッドメン (1992)

いや聞いた事もない

No, I've never even heard of it.

— いまを生きる (1989)

聞いた事信じないように最近とても忙しい

I've been so busy lately that I try not to believe what I hear.

— ラスト、コーション (2007)

トムという名の詩人の事を聞いた事がありますか

Have you ever heard of a poet named Tom?

こんなにいい曲を聞いた事があるかい

Have you ever heard a song this good?

前にその歌を聞いた事がある

I've heard that song before.

聞いた事ないな

I've never heard of it.

— 帰ってきたヒトラー (2015)