のを知っていますか => Do you know...? N4
かも[知「し」]れない => Might A, maybe A, perhaps A N3
Sentence Endings
に行く/に来る/に帰る => go/arrive/go back (to do something) N5
へ => Go to N, head to N , Often followed by verbs like 行く/いく, 来る/くる, 向かう/むかう… N5
Particles