It is shameful that the Gage Canadian allows only  plaid. 
( It ( ( ( is shameful ) ( that ( ( the ( Gage Canadian ) ) ( allows ( only plaid ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ shameful)) (SBAR (IN that) (S (NP (DT the) (NNP Gage) (NNP Canadian)) (VP (VBZ allows) (NP (RB only) (JJ plaid)))))) (. .)))
Gage Canadian shouldn't allow only plaid.
( ( Gage Canadian ) ( ( ( should n't ) ( allow ( only plaid ) ) ) . ) )
(ROOT (S (NP (NNP Gage) (NNP Canadian)) (VP (MD should) (RB n't) (VP (VB allow) (NP (RB only) (JJ plaid)))) (. .)))