( ( Like thunderstorms ) ( , ( tornadoes ( ( can ( form ( ( any time ) ( of ( the year ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Like) (NP (NNS thunderstorms))) (, ,) (NP (NNS tornadoes)) (VP (MD can) (VP (VB form) (NP (NP (DT any) (NN time)) (PP (IN of) (NP (DT the) (NN year)))))) (. .)))
Like thunderstorms, tornadoes can form any time of the year.
(ROOT (S (NP (NNS Tornadoes)) (VP (MD can) (VP (VB occur) (PP (IN in) (NP (DT any))))) (. .)))