how itWhich is correct:, with or without '' by '' : They challenged me to analyze the possibility of performing this treatment by myself. or : They challenged me to analyze the possibility of performing this treatment myself.by?
- They challenged me to analyze the possibility of performing this treatment by myself.
or: - They challenged me to analyze the possibility of performing this treatment myself.
This sentence (without ''by ''by) is chosen by an English software and I do not understand why.