The context information will help in this kind of question. 볼래 and 필요해 mean two quite different things. 볼래: from the root form 보다: see, look, try. It is also used as an auxiliary verb. - 이것 볼래? Do you want ot see this? - 이렇게 해 볼래? Do you want to try it this way? 하다: do; 하다+보다 = 해 보다: give it a try. - 저쪽으로 가 볼래: I'll go try that side; I'll try going that way. The same form 볼래 is used to mean either one's intention or a question. So the "?" or intonation is crucial for understanding the meaning. 필요해: I need (it). - 나는 네가 필요해: I need you. - 도움(이) 필요해?: Do you need help?