Neutrino scattering physics is discussed for investigating internal structure of the nucleon and nuclei at future neutrino facilities. We explain structure functions in neutrino scattering. In particular, there are new polarized functions g3, g4, and g5, and they should provide us important information for determining internal nucleon spin structure. Next, nuclear structure functions are discussed. From F3 structure function measurements, valence‐quark shadowing should be clarified. Nuclear effects on the NuTeV sin2θW anomaly are explained. We also comment on low‐energy neutrino scattering, which is relevant to current long‐baseline neutrino oscillation experiments.

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