私の責任だ

it's my responsibility

→ 私
phrase Rare #24,868
it's my responsibility The plain form of “it's my responsibility”; です is the polite form of だ.
JA: この問題を解決するのは私の責任だ。
EN: It's my responsibility to solve this problem.

不幸は私の責任だ。

My misfortune is my responsibility.

もしそれを発表すれば-私の責任だ

If you announce it, it's my responsibility.

— オデッセイ (2015)

“過ちは私の責任だ”

The mistake is my responsibility.

— マルコムX (1992)

ジョイの自殺が私の責任だと言うのか?

Are you saying Joy's suicide is my fault?

— きっと、うまくいく (2009)

彼らが遅れてきたのは私の責任だ。

It's my fault they were late.