Translation:Well, I don't remember.
"I remember" needs the progressive tense as "I changed my state of remembering sthg, I did and I still do", I do understand that. but does the negative "I don't remember" need it as well?
”さあ” is not really "well". it's more of a verbally expressed thought, like "hm"
Not sure about the last word, but "oboeru" usually means "to memorize/to learn", except when it is in the present progressive form and means "to remember". It has a sense of "continuing to remember". "Omoidasu" means more "to recollect/to recall".
Anyone have any insight on why not remembering is ている but not knowing is ません?
there is not a real verb for "remembering" in japanese, thus we use oboemasu (to memorize) in the continuous form "oboeteimasu"(I am memorizing) to give the sense of "remembering" something.
Watashi wa oboemasen - I do not memorize watashi wa oboeteimasen - I do not remember