I did it myself. - Zrobilem to sam.
You did it yourself - zrobiles to sam.
We did it ourselves - zrobilismy to sami, itd.
Reflexive pronouns - zaimki zwrotne- musza sie zgadzac z podmiotem, do ktorego sie odnosza.
Tom hurt himself. - Tom sie zranil/ skaleczyl.
Agnes hurt herself
They lived by themselves - mieszkali sami