do we need languages to communicate to others???

If u want effective communication u need to respond in talking it is even more faster and effective

No, I dont think so. I think body languages have a limited way to communicate. For example, Smile says a lot. Sometimes people smile becasue they dont want to talk, sometimes they smile because they dont like you, there are lot of ways of smiling. I think at least little bit of conversation level of languages is needed to communicate with body languages.