( There ( ( are ( ( ( ( ( ( ( ( four forces ) -LRB- ) gravity ) , ) ( electromagnetic ( , ( ( strong and ) weak ) ) ) ) -RRB- ) and ) ( ( two types ) ( of ( particles ( -LRB- ( ( ( bosons and ) fermions ) -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (NP (CD four) (NNS forces)) (-LRB- -LRB-) (NP (NN gravity)) (, ,) (ADJP (JJ electromagnetic) (, ,) (JJ strong) (CC and) (JJ weak)) (-RRB- -RRB-)) (CC and) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NP (NNS particles)) (PRN (-LRB- -LRB-) (NP (NP (NNS bosons)) (CC and) (NP (NNS fermions))) (-RRB- -RRB-))))))) (. .)))
There are four forces (gravity, electromagnetic, strong and weak) and two types of particles (bosons and fermions).
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS types)) (PP (IN of) (NP (NNS bosons))))) (. .)))