But it was quite a natural suggestion for a layman to make."
( But ( it ( ( ( was ( ( quite ( a ( natural suggestion ) ) ) ( for ( a ( layman ( to make ) ) ) ) ) ) . ) '' ) ) )
(ROOT (S (CC But) (NP (PRP it)) (VP (VBD was) (NP (NP (RB quite) (DT a) (JJ natural) (NN suggestion)) (PP (IN for) (NP (DT a) (NN layman) (S (VP (TO to) (VP (VB make)))))))) (. .) ('' '')))
No one could think of a single idea. 
( ( No one ) ( ( could ( think ( of ( a ( single idea ) ) ) ) ) . ) )
(ROOT (S (NP (DT No) (NN one)) (VP (MD could) (VP (VB think) (PP (IN of) (NP (DT a) (JJ single) (NN idea))))) (. .)))