it shaking in a friend of a group .
(ROOT_0 (S_0 (ATS_3 (NP_0 (PRP_1 it)) (VP_2 (VBG_0 shaking) (PP_2 (IN_0 in) (NP_3 (NP_5 (DT_0 a) (NN_2 friend)) (PP_0 (IN_1 of) (NP_5 (DT_0 a) (NN_2 group))))))) (DOT_0 .)))