If any of us at the dental school can be of assistance, please write or call.
( ( If ( ( any ( of ( us ( at ( the ( dental school ) ) ) ) ) ) ( can ( be ( of assistance ) ) ) ) ) ( , ( ( please ( ( write or ) call ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT any)) (PP (IN of) (NP (NP (PRP us)) (PP (IN at) (NP (DT the) (JJ dental) (NN school)))))) (VP (MD can) (VP (VB be) (PP (IN of) (NP (NN assistance))))))) (, ,) (VP (VB please) (VP (VB write) (CC or) (VB call))) (. .)))
The dental school doesn't not accept letters or phone calls.
( ( The ( dental school ) ) ( ( ( does n't ) ( not ( accept ( letters ( or ( phone calls ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ dental) (NN school)) (VP (VBZ does) (RB n't) (VP (RB not) (VB accept) (NP (NNS letters) (CC or) (NN phone) (NNS calls)))) (. .)))