não fiz o que prometi fazer

I didn't do what I promised to do

→ não
phrase Rare #41,598
I didn't do what I promised to do Used to admit that you failed to carry out something you had promised. The subject eu is often omitted because the verb form already indicates it.
PO: Desculpe, não fiz o que prometi fazer.
EN: I'm sorry, I didn't do what I promised to do.

Eu admito que não fiz o que prometi fazer.

I admit that I didn’t do what I promised to do.

Eu admito que eu não fiz o que prometi fazer.

I admit that I didn’t do what I promised to do.

Admito que não fiz o que prometi fazer.

I admit that I didn't do what I promised to do.

Admito que eu não fiz o que prometi fazer.

I admit that I didn't do what I promised to do.