( ( Types ( of ( simple machines ) ) ) ( There ( ( are ( ( a number ) ( of ( ( different types ) ( of ( simple machines ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (NNS Types)) (PP (IN of) (NP (JJ simple) (NNS machines)))) (ADVP (RB There)) (VP (VBP are) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (NP (JJ different) (NNS types)) (PP (IN of) (NP (JJ simple) (NNS machines))))))) (. .)))
Types of simple machines There are a number of different types of simple machines.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types) (NNS types)) (PP (IN of) (NP (JJ simple) (NNS machines))))) (. .)))