So a normal way to say "Bob wants a burger" might be:
bobu-wa hanbaaga-ga hoshii bob-TOPIC burger-NOMINATIVE is_wanted as for Bob, a burger is wanted
[I'm only vaguely familiar with the standard conventions for grammatical glossing; feel free to edit that if you want.]
wa is really just the topic marker.
Technically, it doesn't actually explicitly establish the grammatical role of
bobu within the... hm, "predicate structure" of
Is it possible to actually explicitly connect
hoshii like that?
(Neverminding the question of a context where it would sound natural.)
Maybe something like this?:
bobu-ni hanbaaga-ga hoshii bob-DATIVE burger-NOMINATIVE is_wanted a burger is wanted by Bob
(Or maybe with a different order like:
hanbaaga-ga bobu-ni hoshii burger-NOMINATIVE bob-DATIVE is_wanted
if that sounds better. Not the main point.)
Or maybe another way of asking this question:
If someone told you:
hanbaaga-ga hoshii burger-NOMINATIVE is_wanted a burger is wanted (by him)
They're assuming you understand from context who the implicit "wanter" is.
But if it's actually not clear, and you have to ask:
"*Who* wants a burger?"
then how do you do that?
(In a complete sentence!
Of course pragmatically you would prolly just use a fragment like "dare?" or something,
but there must be an implied complete sentence,
I assume this would be wrong:
dare-wa hanbaaga-ga hoshii ka? who-topic burger-NOMINATIVE is_wanted QUESTION as for who, a burger is wanted?
So how about this?:
dare-ni hanbaaga-ga hoshii ka? dare-DATIVE burger-NOMINATIVE is_wanted QUESTION by who is a burger wanted?
(Or, again, flip the order:
hanbaaga-ga dare-ni hoshii ka? burger-NOMINATIVE dare-DATIVE is_wanted QUESTION a burger is wanted by who?
if that sounds better.)