( ( ( ( ( ( Our ( home sauna ) ) ( ( is ( of course ) ) wood-fired ) ) , ) and ) ( ( ( ( propane , ) ( as ( you know ) ) ) , ) ( can ( be ( useful ( in ( some circumstances ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP$ Our) (NN home) (NN sauna)) (VP (VBZ is) (PP (IN of) (NP (NN course))) (ADJP (JJ wood-fired)))) (, ,) (CC and) (S (NP (NP (NN propane)) (, ,) (SBAR (IN as) (S (NP (PRP you)) (VP (VBP know)))) (, ,)) (VP (MD can) (VP (VB be) (ADJP (JJ useful) (PP (IN in) (NP (DT some) (NNS circumstances))))))) (. .)))
Our home sauna is of course wood-fired,and propane, as you know, can be useful in some circumstances.
(ROOT (S (PP (RB Instead) (IN of) (NP (NN wood))) (, ,) (NP (DT some) (NNS fireplaces)) (VP (VBP use) (NP (NN propane))) (. .)))