Can you learn a language just by listening?

 Is it possible for you to learn a language just by listening?

after a while you do kind of understand what people are talking about, so you can often guess from the situation. But You are not able to put a sentence together, and join in the conversation. Because although you kind of understand what people are saying, you just haven't developed the skill of moving your tongue and saying the words of the other language.

So I would say taking that approach is a very, very frustrating, and slow, and ineffective way to learn any language. And that's based from my personal experience.