Is there no indication in the hints that there should be an "Is" in the beginning of the sentence or am I missing something ?
Normally you don't write the "is", because you can recognize the person by the form of verb. I guess its just to help you. The "Is" is not necessary.
Why is it "Is non est Marcus" and not "Est non Marcus"?
You are negating the verb (est) not the noun (Marcus).
Also, Duolingo wants us to practice the pronoun.
Why is "Is non Marcus est" also valid? I am probably wrong but is that not negating the noun?
I don't know
Where would you even use this IRL unless you are in scooby-doo or something and someone is disguised as Marcus and claims to actually be Marcus.
We'll see who's laughing when I finish this course and get hired to write the official Latin dub script for Scooby-Doo.
est non Marcus (est Duo)
It repeated Marcus three times. I couldn't get rid of the extra Marcus
Try reporting it, and it should eventually get fixed.
Is it more natural to have "Is Marcus non est?"? or what is the more natural?
Does anyone else keep typing in english instead of latin? i hope i'm not the only one facepalm