I typed "mnóstwo" what is quite like "dużo" and i've got wrong
"Mnóstwo" is more than "dużo" They aren't synonym
zrobiłem was not available to me.
zrobiłam is correct too?
Yes. In Past Tense, the gender of the subject of the sentence is always visible. A man will says "zrobiłem". A woman will say "zrobiłam".
Wczoraj zrobiłam byIem dużo jedzenia?
Why is it "jedzeniA" ?
Because quantifiers like "dużo" take genitive :)
How about "Zrobiłem wczoraj dużo jedzenia"?
I'm surprised that it hasn't been accepted so far... added now.
I went for "robiłem", and it was marked as a typo. Obviously the perfective aspect is appropiate, but which is which...
Usually the perfective variant is a bit longer. That's what the users claim, at least ;)
That might be the rule of thumb I have been looking for desperately. I'll give it a try.
I think "narobić" would suit this sentence well?
My answer "Narobiłem wczoraj dużo jedzenia" wasn't accepted.
Yes, "narobić" suggests by itself making a lot of something, so it fits well. Added.