  We study pentaquark states of both light $q^4\bar q$ and hidden heavy $q^3
Q\bar Q$ (q = u,d,s quark in SU(3) flavor symmetry; Q = c, b quark) systems
with a general group theory approach in the constituent quark model, and the
spectrum of light baryon resonances in the ansatz that the $l=1$ baryon states
may consist of the $q^3$ as well as $q^4\bar q$ pentaquark component. The model
is fitted to ground state baryons and light baryon resonances which are
believed to be normal three-quark states. The work reveals that the
$N(1535)1/2^{-}$ and $N(1520)3/2^-$ may consist of a large $q^4\bar q$
component while the $N(1895)1/2^{-}$ and $N(1875)3/2^-$ are respectively their
partners, and the $N^+(1685)$ might be a $q^4\bar q$ state. By the way, a new
set of color-spin-flavor-spatial wave function for $q^3 Q\bar Q$ systems in the
compact pentaquark picture are constructed systematically for studying hidden
charm pentaquark states.
