Let's head off an auxiliary crisis before it happens!
( ( Let 's ) ( ( ( ( head off ) ( an ( auxiliary crisis ) ) ) ( before ( it happens ) ) ) ! ) )
(ROOT (S (NP (NNP Let) (POS 's)) (VP (VBP head) (PRT (RP off)) (NP (DT an) (JJ auxiliary) (NN crisis)) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ happens))))) (. !)))
An auxiliary crisis should be stopped before it happens!
( ( An ( auxiliary crisis ) ) ( ( should ( be ( stopped ( before ( it happens ) ) ) ) ) ! ) )
(ROOT (S (NP (DT An) (JJ auxiliary) (NN crisis)) (VP (MD should) (VP (VB be) (VP (VBN stopped) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ happens))))))) (. !)))