  It is well known that a smooth projective Fano variety is rationally
connected. Recently Zhang (and later Hacon and McKernan as a special case of
their work on the Shokurov RC-conjecture) proved that the same conclusion holds
for a klt pair $(X,\D)$ such that $-(K_X+\D)$ is big and nef. We prove here a
natural generalization of the above result by dropping the nefness assumption.
Namely we show that a klt pair $(X,\D)$ such that $-(K_X+\D)$ is big is
rationally connected modulo the non-nef locus of $-(K_X+\D)$. This result is a
consequence of a more general structure theorem for arbitrary pairs $(X,\D)$
with $-(K_X+\D)$ pseff.
