"I'm sure that I'm not going to forget."
Translation:Je suis sûr que je ne vais pas oublier.
"Je suis sûr que je ne vais pas à oublier " was marked wrong. Why? In a similar construction elsewhere, I was marked wrong because I didn't use "à" before the infinitive verb. I remember, the verb was " manger". I had left the comment that time also. Have still to receive clarification. Please clarify.