내가 이걸

I ... this

→ 나
phrase Rare #26,559
I ... this An emphatic combination of 내가 (“I”) and 이걸 (“this”), often used to emphasize that the speaker is the one doing something to or with this object. The verb usually comes after 이걸.
KO: 내가 이걸 어떻게 잊겠어?
EN: How could I forget this?

내가 이걸 했다.

I did this.

내가 이걸 너 한테 줘야 해?

Why should I give this to you?