  The recent calculation of the four nucleon continuum spectrum are reviewed.
Faddeev-Yakubovsky equations in configuration space have been solved for the
four nucleon system with special interest in their scattering states. We
present results concerning the structure of the first $^4$He, scattering states
in different (T,S) channels including the first inelatic threshold
N+3N$\to$NN+NN and the n-t cross section using realistic potentials.
