그들은 나를 包含해요.
Why is this sentence in a lesson about passive structures? I can't see any passive form in this sentence. Well, I guess I'll just change it to passive on my own:
그들은 나를 포함해요. -> active
나는 그들[에게서(formal)/한테서(casual)] 포함돼요. -> passive
It teaches the new verb 포함하다 and helps contrast with 포함되다 in other examples
Been wondering this too, most sentences aren't even in the passive. Hope they change this in the next tree update.