We wouldn't exist if the need weren't there.
( We ( ( ( would n't ) ( exist ( if ( ( the need ) ( ( were n't ) there ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD would) (RB n't) (VP (VB exist) (SBAR (IN if) (S (NP (DT the) (NN need)) (VP (VBD were) (RB n't) (ADVP (RB there))))))) (. .)))
We're here regardless of whether or not there's a problem.
( We ( ( ( ( 're ( here regardless ) ) of ) ( ( ( whether or ) not ) ( there ( 's ( a problem ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP 're) (ADVP (RB here) (RB regardless)) (PP (IN of)) (SBAR (IN whether) (CC or) (RB not) (S (NP (EX there)) (VP (VBZ 's) (NP (DT a) (NN problem)))))) (. .)))