I did that
I did this once.
Ne veux-tu pas savoir pourquoi j'ai fait ça ?
Don’t you want to know why I did that?
J'ai fait ça parce que je l'aime.
I did this because I love him.
How did I do that?
I did this for your own good.
Je ne sais pas comment j'ai fait ça.
I don't know how I did that.
I did that deliberately.
I did that to survive.
J'ai fait ça toute la journée.
I've been doing that all day.