moralize
moralise, / ˈmɔrəlaɪz; ?@ ˈmɔ:r-; `mɔrəlˌaɪz/ v[I, Ipr]
~ (about/on sth) (esp derog 尤作贬义) talk or write (usu critically) about right and wrong behaviour, esp in a self-righteous way 训导, 说教（尤指自以为是）
He's always moralizing about the behaviour of young people. 他总是就年轻人的行为进行说教.