  We calculate the charge form factor and the longitudinal structure function
for $^{16}$O and compare with the available experimental data, up to a momentum
transfer of 4 fm$^{-1}$. The ground state correlations are generated using the
coupled cluster [exp(S}] method, together with the realistic v-18 NN
interaction and the Urbana IX three-nucleon interaction. Center-of-mass
corrections are dealt with by adding a center-of-mass Hamiltonian to the usual
internal Hamiltonian, and by means of a many-body expansion for the computation
of the observables measured in the center-of-mass system.
