( ( ( An example ) ( of this ) ) ( ( occurs ( when ( one ( tries ( to ( ( start ( a ( friction fire ) ) ) ( with ( ( ( ( very resinous ) wood ) , ) ( such ( as ( ( ( ( ( burned ( pine roots ) ) ( -LRB- ( ( pitch pine ) -RRB- ) ) ) , ) and ) ( ( a ( slippery ( glaze forms ) ) ) ( preventing ( ( the formation ) ( of ( wood dust ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (NN example)) (PP (IN of) (NP (DT this)))) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (PRP one)) (VP (VBZ tries) (S (VP (TO to) (VP (VB start) (NP (DT a) (NN friction) (NN fire)) (PP (IN with) (NP (NP (ADJP (RB very) (JJ resinous)) (NN wood)) (, ,) (PP (JJ such) (IN as) (NP (NP (JJ burned) (NN pine) (NNS roots)) (PRN (-LRB- -LRB-) (NP (NN pitch) (NN pine)) (-RRB- -RRB-)) (, ,) (CC and) (NP (NP (DT a) (JJ slippery) (CD glaze) (NNS forms)) (VP (VBG preventing) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN wood) (NN dust))))))))))))))))) (. .)))
An example of this occurs when one tries to start a friction fire with very resinous wood, such as burned pine roots (pitch pine), and a slippery glaze forms preventing the formation of wood dust.
(ROOT (S (NP (NNP Wood) (NNP burning)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (JJ different) (NN substance)) (VP (VBG being) (VP (VBN formed))))))) (. .)))