Why is this ne not he?
Both should be accepted. We don't know from this context if the person is talking about items (ne) or people (he).
There is only one correct answer. “Right here“ is not the same as "right there". So the correct answer is " Ovatko ne tuossa? “ Because "Ovatko he tässä? " would be "Are they right here? "
But... Why? Why "Right there" can't be for people? (I'm not english native speaker, sorry)
I have the same question... Like can it never be used for people and that's how you distinguish it?
What is 'ne'?
Plural form of "se". If "they" refers to a collection of objects, use "ne".
When do you use "se" in a sentence?
"Is it right there? ", "Onko se tuossa?" If you are refering to only one piece of something.
I accidentally typed "onko" instead of "ovatko" and Duolingo accepted it! Is "onko ne..." really an acceptable way of asking "are they..."?
It's commonplace in colloquial registers to substitute plural 3rd person verbs with singular 3rd person verbs, so it usually is, but not when writing an academic paper, for example.
So why is 'ovatko he' among hints if it's incorrect?
It's not incorrect.