Why the suffix 'yu?
Definite accusative case ;)
' because Duo is a proper noun
y because Duo ends in a vowel
u because of vowel harmony (u after o or u, ü after ö or ü, ı after a or ı, i after e or i)
Duo -> Duo'yu, çay -> çayı, kaplumbağa -> kaplumbağayı, kuş -> kuşu, …
I'm wondering the same thing.. and whether this will be in a future lesson or not..
There is a spelling error in one of the suggested correct solutions, "Dud you also invite Duo?" (reported).
You can just report that.
How would you know that the correct word here is "invite" and not "call"? Or would it just depend on the context?
Yes you are right. The concept is crucial.
To invite (eg. sb. to a party)
To call out (eg. the kids to come home)