( ( An insulator ) ( only ( ( ( allows heat ) ( to ( ( move ( through it ) ) slowly ) ) ) . ) ) )
(ROOT (S (NP (DT An) (NN insulator)) (ADVP (RB only)) (VP (VBZ allows) (NP (NN heat)) (S (VP (TO to) (VP (VB move) (PP (IN through) (NP (PRP it))) (ADVP (RB slowly)))))) (. .)))
An insulator only allows heat to move through it slowly.
(ROOT (S (NP (NNP Rubber)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-) (NNS insulators)) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB allow) (S (NP (NNS electrons)) (VP (TO to) (VP (VB move) (PP (IN through) (NP (PRP them)))))))))))))) (. .)))