Compare these sentences:

• Tom didn't have a cat. (Someone else did.)
• Tom didn't have a cat. (But now he has one.)
  
• Tom didn't have a cat. (He had a dog.)
  

You can create different meanings with your voice. Depending on where the stress is and what type of intonation you use, you can emphasise different words or form questions. As you can see from the examples, the written sentence is always the same (unless you use italics) - intonation makes a big difference!

• Again, the Headway and How now brown cow? courses in PUHUMO offer good exercises on intonation. You will learn for example about Wh- and Yes/No -questions, lists and contrastive stress.

• Peter Ladefoged's Books: These pages contain lots of audio examples about various topics concerning pronunciation, ranging from the IPA chart sounds to talking computers. You will find examples of intonation patterns in 2. Pitch and Loudness.
  

• ESL Pronunciation Work Page: Here you can listen to English and practise your pronunciation. In addition to intonation, the page contains information about word and phrasal stress, thought groups, emphasis, reduction, linking, consonants and vowels. There are also links and additional material on listening and practising.

• American Accent Training: This page contains only text, but it is very informative. You will learn about intonation concerning new information, contrast, meaning, pronunciation and mood or personality.