"He does not help the cow."
Translation:그는 소를 도와주지 않아요.
What I know is that: the 하다 verbs cannot be negated with 안 before the verb but in the middle of it.
E.g. the verb to sing = 노래하다* :
I don't sing = 저는 노래 안 해요 = 저는 노래지 않아요.
So I think maybe the verbs introduced in this skill "compound verbs" like ~주다 ~보다 ~가다 and ~오다 are similar to ~하다 verbs.