what an idea , what a thrill ride 
(ROOT (SBAR (WHNP (WP what) (DT an) (NN idea)) (, ,) (WHNP (WP what) (DT a) (NN thrill) (NN ride))))
(ROOT (SBAR (WHNP (WP ) (DT ) (NN )) (, ) (WHNP (WP ) (DT ) (NN ) (NN ))))