( There ( ( are ( ( ( two ( high tides ) ) and ) ( ( two ( low tides ) ) ( a day ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (JJ high) (NNS tides)) (CC and) (NP (NP (CD two) (JJ low) (NNS tides)) (NP (DT a) (NN day))))) (. .)))
There are two high tides and two low tides a day.
(ROOT (S (NP (NP (CD Two) (NN low)) (CC and) (NP (JJ high) (NNS tides))) (VP (VBP occur) (PP (IN per) (NP (NN day)))) (. .)))