we have tickets waiting for us
( we ( have ( tickets ( waiting ( for us ) ) ) ) )
(ROOT (S (NP (PRP we)) (VP (VBP have) (NP (NP (NNS tickets)) (VP (VBG waiting) (PP (IN for) (NP (PRP us))))))))
There are tickets we have that are waiting for us.
( There ( ( are ( tickets ( we ( have ( that ( are ( waiting ( for us ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (NNS tickets)) (SBAR (S (NP (PRP we)) (VP (VBP have) (NP (NP (DT that)) (SBAR (S (VP (VBP are) (VP (VBG waiting) (PP (IN for) (NP (PRP us))))))))))))) (. .)))