( Here ( , ( Mark ( ( ( seeks shelter ) ( under ( some rocks ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Here)) (, ,) (NP (NNP Mark)) (VP (VBZ seeks) (NP (NN shelter)) (PP (IN under) (NP (DT some) (NNS rocks)))) (. .)))
Here, Mark seeks shelter under some rocks.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP it)) (VP (VBZ rains)))) (, ,) (NP (DT some) (NNS animals)) (VP (MD will) (VP (VB move) (S (VP (TO to) (VP (VB seek) (NP (NN shelter))))))) (. .)))