( This ( ( ( repeats ( ( again and ) again ) ) ( in ( a ( never-ending cycle ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ repeats) (ADVP (RB again) (CC and) (RB again)) (PP (IN in) (NP (DT a) (JJ never-ending) (NN cycle)))) (. .)))
This repeats again and again in a never-ending cycle.
(ROOT (S (NP (DT The) (NN water) (NN cycle)) (VP (VBZ ends) (SBAR (IN with) (S (NP (PRP it)) (VP (VBZ repeats) (NP (PRP itself)))))) (. .)))
The water cycle ends with it repeats itself.