( They ( ( ( are not ) ( used ( within ( ( five days ) ( following ( ( a rain ) ( during ( a ( drought period ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (RB not) (VP (VBN used) (PP (IN within) (NP (NP (CD five) (NNS days)) (PP (VBG following) (NP (NP (DT a) (NN rain)) (PP (IN during) (NP (DT a) (NN drought) (NN period))))))))) (. .)))
They are not used within five days following a rain during a drought period.
(ROOT (S (NP (NNS Droughts)) (VP (VBZ occurs) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (ADJP (JJ little) (PP (TO to) (NP (NP (DT no) (NN rain)) (PP (IN in) (NP (NP (DT a) (NN period)) (PP (IN of) (NP (NN time)))))))))))) (. .)))