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