"What does the boy say?"
Translation:Τι λέει το αγόρι;
I think the main difference is the same as between the verbs 'say' (λέω) and 'speak' (μιλάω), one is used to express the fact of articulating a message and the other to implicate the speaking capacity. Correct me if im wrong!
In some of your answers you have an accent on the Ti. I had thought it was like Spanish, when there is a question, the interrogative pronoun is accented.
It's like in Spanish when it comes to the words "πού"=where and "πώς"=how.