We have heard, seen this pattern before.
( We ( ( have ( ( ( ( heard , ) seen ) ( this pattern ) ) before ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP have) (VP (VBN heard) (, ,) (VBN seen) (NP (DT this) (NN pattern)) (PP (IN before)))) (. .)))
This pattern is familiar to us.
( ( This pattern ) ( ( is ( familiar ( to us ) ) ) . ) )
(ROOT (S (NP (DT This) (NN pattern)) (VP (VBZ is) (ADJP (JJ familiar) (PP (TO to) (NP (PRP us))))) (. .)))