Is there any reason the suggested answer is "lete vitabu"? Should it not be "leta"?Is "kuleta" irregular? Or is this just a mistake?
Lete is irregular.
Why is "Leteni vitabu" wrong? Is there any reason for that? I am just learning with Duo.
No, that's correct too and should be accepted. The English sentence gives us no clue about whether it's to a single person or many, so both should be accepted, both lete and leteni.
The reason is just because the course was rushed.
Thank you very much!!