"Το παρελθόν των προγόνων μας."

Translation: Our ancestors' past.

[bonbayel]

In the version with word tiles, there's no apostrophe on ancestors, which makes the options nonsensical. I've reported it.

[jaye16]

The missing apostrophe is a serious issue on many courses. We hope that the new web design has eliminated that but it may not affect pre-existing sentences.

It would be a help if you reported it directly since the moderators do not have the means to alter this:

https://support.duolingo.com/hc/en-us

[Kavafy]

Word choice exercise doesn't include the possessive ancestors

[PaulTsotso]

why is "the past of our ancestors" incorrect

[jaye16]

The possessive with "of" is mostly for inanimate objects but I've included it here. It's a phrase I wouldn't use preferring the more natural "Our ancestors' past."

[DimitrisKo891771]

There is no apostrophe on "ancestors"

[jaye16]

If you look at my comment on this page you'll see that we are aware of the issue and despite our reports to the technical staff it still hasn't been corrected. We'll keep trying.

[VanessaGor47801]

our ancestral past for the past of our ancestors?

[jaye16]

The Greek expression used here has a slightly different emphasis. "ancestral past" in Greek would be "προγονικό παρελθόν" ' We appreciate all your help.