Have you ever watched a film or listened to a song in English and have known all the words but still not been able to understand what you have heard.
This video illustrates why. It takes a sentence and looks at 'stressing' different words implying different meanings. The meaning of the sentence changes a lot depending on which word is selected . Adam creates some very different sentences without changing any of the words. He goes on to look at the word 'really' and by using different intonations he implies different meanings in different social situations.
An excellent intermediate resource focusing on speaking and oral skills.