The plane is making strange moves.
( ( The plane ) ( ( is ( making ( strange moves ) ) ) . ) )
(ROOT (S (NP (DT The) (NN plane)) (VP (VBZ is) (VP (VBG making) (NP (JJ strange) (NNS moves)))) (. .)))
The plane is not flying normally.
( ( The plane ) ( ( ( is not ) ( flying normally ) ) . ) )
(ROOT (S (NP (DT The) (NN plane)) (VP (VBZ is) (RB not) (VP (VBG flying) (ADVP (RB normally)))) (. .)))