In this statement, what is the function of 令？ and why is it not 對？ I was kind of expecting to see a “對” somewhere here.
令 has the meaning of "make"
You sing by my ear side everyday [make] me very depress
對 means "to"
You sing by my ear side everyday, [to] me is a kind of torture
You sing by my ear side everyday is a kind of torture [to] me
Notice: "令"(make) is a verb. "對" (to) is a preposition