'Kateřina promised not to forget' - acceptable?
I think the rules do not rule it out. Added.
Me to nevzalo. Je to schvalene?
"Kateřina promised not to forget" is accepted. Maybe there was a glitch.
And BTW, "Mně to nevzalo". Otherwise it would mean "it didn't take me".
Alternatively could you say "Kateřina slíbila aby nezapomněla"?
no, unless you want to say that she made a promise in order not to forget. But even then there is an object of the promise missing.
is the verb "nezapomene" from zapomenout which means forget/perfective= future correct? thanks
Yes, it is. More literally, it is "she will not forget."