( Tornados ( ( can ( happen ( at ( ( any time ) ( of ( the year ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Tornados)) (VP (MD can) (VP (VB happen) (PP (IN at) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN year))))))) (. .)))
Tornados can happen at any time of the year.
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN in) (NP (DT any))))) (. .)))