"Julia did not drink milk."
Translation:जूलिया ने दूध नहीं पिया।
In the simple past tense, transitive verbs (verbs which can take a direct object) conjugate with their object. For example, दूध is a direct object of the verb पीना in this sentence.
When this happens, you have to add a ने to the subject to indicate that the verb is not agreeing with the subject.