  The d+N systems are studied in a three-body model, using phenomenological N-N
interactions. The scattering matrices are calculated by using the Kohn-Hulthen
variational method. Then, they are analytically continued to complex energies
and their singularities are localized. We find a virtual state at E=-1.66 MeV
in H-3 and a pair of states at E=(-0.42+-i0.52) MeV in He-3 relative to the d+N
thresholds, respectively. In addition, we discuss some general aspects and
problems of virtual states which may be useful also in the study of other
systems, like Li-10.
