There is no doubt that Randall enjoys her work.
( There ( ( is ( no ( doubt ( that ( Randall ( enjoys ( her work ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (ADVP (DT no) (NN doubt) (SBAR (IN that) (S (NP (NNP Randall)) (VP (VBZ enjoys) (NP (PRP$ her) (NN work))))))) (. .)))
There exists some doubt as to whether Randall enjoys her work or not.
( There ( ( exists ( ( ( some doubt ) ( as to ) ) ( ( ( whether ( Randall ( enjoys ( her work ) ) ) ) or ) not ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ exists) (ADVP (ADVP (NP (DT some) (NN doubt)) (RB as) (PP (TO to))) (SBAR (IN whether) (S (NP (NNP Randall)) (VP (VBZ enjoys) (NP (PRP$ her) (NN work)))) (CC or) (RB not)))) (. .)))