( ( ( Should ( an accident ) ) occur ) ( , ( ( ( report ( to ( the ( ( teacher or ) school ) ) ) ) ( personnel ( in ( charge ( of ( supervision IMMEDIATELY ) ) ) ) ) ) . ) ) )
(ROOT (SINV (SINV (MD Should) (NP (DT an) (NN accident)) (VP (VB occur))) (, ,) (VP (VBP report) (PP (TO to) (NP (DT the) (NN teacher) (CC or) (NN school)))) (NP (NP (NNS personnel)) (PP (IN in) (NP (NP (NN charge)) (PP (IN of) (NP (NN supervision) (NN IMMEDIATELY)))))) (. .)))
Should an accident occur, report to the teacher or school personnel in charge of supervision IMMEDIATELY.
(ROOT (S (SBAR (IN If) (S (NP (DT an) (NN accident)) (VP (VBZ happens) (PP (IN during) (NP (DT a) (NN science) (NN experiment)))))) (, ,) (NP (NP (DT the) (JJ first) (NN thing)) (SBAR (S (NP (DT a) (NN student)) (VP (MD should) (VP (VB do)))))) (VP (VBZ is) (NP (NP (NN report)) (PP (TO to) (NP (DT the) (NN teacher))))) (. .)))