it would be great if someone could help me. As I understand, according to the rules - there are 3 syllables in the word : "regarder" = re+gar+der. Why there is no accent aigu for the first syllable? It's open and it doesn't belong to the (r,d,z,f) list.
My guess is that she thought it was pronounced "régarder", so that list would be what makes a "e" sound like a "é" (-er at the end of the verbs, -ed like in "pied", -ez for second person plural, -ef like in "clef"), but that would be a strange list, very incomplete and not even 100% right.