( ( In general ) ( , ( ( a ( lunar eclipse ) ) ( ( ( takes ( place ( when ( ( the Moon ) ( falls ( -- ( ( either ( ( partially or ) entirely ) ) -- ) ) ) ) ) ) ) ( into ( ( the ( Earth 's ) ) shadow ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN general))) (, ,) (NP (DT a) (NN lunar) (NN eclipse)) (VP (VBZ takes) (NP (NP (NN place)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NNP Moon)) (VP (VBZ falls) (PRN (: --) (ADVP (DT either) (RB partially) (CC or) (RB entirely)) (: --)))))) (PP (IN into) (NP (NP (DT the) (NN Earth) (POS 's)) (NN shadow)))) (. .)))
In general, a lunar eclipse takes place when the Moon falls -- either partially or entirely -- into the Earth's shadow.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (NN earth) (POS 's)) (NN shadow)) (VP (VBZ falls) (PP (IN on) (NP (DT the) (NN moon)))))) (, ,) (NP (DT the) (NN shadow)) (VP (VBZ causes) (NP (DT a) (NN lunar) (NN eclipse))) (. .)))
When earth’s shadow falls on the moon, the shadow causes a lunar eclipse.