Listening is a key element of the verbal communication process. We spend a good portion of our time listening, and this involves paying attention to what we hear and understanding what it means. Having an extensive vocabulary helps, but to listen successfully you need to be able to figure out the situational nuances – what meanings do the words convey in different circumstances? If you can’t, your communication abilities are severely handicapped.
When you’re learning a new language, listening is more difficult than reading or speaking. Try listening to a radio broadcast in a language you don’t know. It comes across as a barrage of indecipherable sounds; it’s hard to figure out where a word starts and ends, let alone a sentence. It seems impossible that you will ever understand or manage to speak the language. But, you know, we picked up our mother tongue by listening, and we can do the same with learning a new language.