That must be a really big deal.
( That ( ( must ( be ( a ( ( really big ) deal ) ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (MD must) (VP (VB be) (NP (DT a) (ADJP (RB really) (JJ big)) (NN deal)))) (. .)))
That seems like a rather important thing.
( That ( ( seems ( like ( a ( ( rather important ) thing ) ) ) ) . ) )
(ROOT (S (NP (DT That)) (VP (VBZ seems) (PP (IN like) (NP (DT a) (ADJP (RB rather) (JJ important)) (NN thing)))) (. .)))