( (IP (IP (NP-SBJ (PN 这些))
(VP (ADVP (AD 也))
(ADVP (AD 还))
(VP (VV 罢了))))
(PU ，)
(IP (ADVP (AD 也许))
(NP-SBJ (DP (DT 另)
(QP (CD 一)
(CLP (M 种))))
(NP (NN 解释)))
(VP (VC 是)
(PU ，)
(IP-PRD (IP (NP-SBJ (NN 社会))
(VP (ADVP (AD 没有))
(VP (VV 退步))))
(PU ，)
(CP (IP (ADVP (AD 但是))
(NP-SBJ (DP (DT 有些))
(NP (NN 人)))
(VP (ADVP (AD 只是))
(ADVP (AD 没有))
(VP (VV 进步))))
(SP 而已)))))
(PU ，)))
ARG0: 社会
ARGM-ADV: 没有
REL: 退步