Is she putting a stress accent on the last syllable of noví? When I was taking Czech many years ago, I was taught that the stress was always on the first syllable, while the accent indicated vowel length, as in Hungarian. Do the accents actually indicate stress?
No, the accents indicate the length of the vowel. The stress is still on the first syllable.
Good, my memory is sound, I just haven't been hearing the language for a couple of decades or so.
The words for "this" and "these" will come later. The formal-singular-nominative-masculine-animate word for "this" is Tento. And for plural it's Tito. Hence...
Tito kluci nejsou noví