a boy happened in fine gravel surfers . <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (ATS_3 (NP_1 (DT_0 a) (NN_2 boy)) (VP_4 (VBN_0 happened) (PP_0 (IN_1 in) (NP_2 (ATNP_0 (JJ_0 fine) (JJ_1 gravel)) (NP_4 (NNS_1 surfers)))))) (DOT_0 .)) (APOSTROPHE_0 <apostrophe><apostrophe>)))