( There ( ( ( are always ) ( ( ( ( at least ) two ) ( lunar eclipses ) ) ( per year ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (ADVP (RB always)) (NP (NP (QP (IN at) (JJS least) (CD two)) (JJ lunar) (NNS eclipses)) (PP (IN per) (NP (NN year))))) (. .)))
There are always at least two lunar eclipses per year.
(ROOT (S (NP (CD Two)) (VP (VBZ is) (NP (NP (DT the) (JJ minimum) (NN number)) (PP (IN of) (NP (NP (NNS times)) (SBAR (S (NP (DT a) (JJ partial) (NN lunar) (NN eclipse)) (VP (MD will) (VP (VB occur) (NP (DT each) (NN year)))))))))) (. .)))