( ( ( Four : ) ( ( ( ( How many ) types ) ( of dinosaurs ) ) ( are known ) ) ) ? )
(ROOT (X (NP (CD Four)) (: :) (FRAG (SBAR (WHNP (WHNP (WHADJP (WRB How) (JJ many)) (NNS types)) (PP (IN of) (NP (NNS dinosaurs)))) (S (VP (VBP are) (VP (VBN known)))))) (. ?)))
Four: How many types of dinosaurs are known?
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS types)) (PP (IN of) (NP (NNS bosons))))) (. .)))