I am amazed. I was sure I put it there. Intonation is used to put certain words in the foreground. Speakers use pitch to give words stress. Low pitch is used to put things in the background, to treat something as old, to show anger, or as shared information.
Intonation is used to signal ends and beginnings in conversation.
It is used to show whether a situation is open or closed. A high or rising pitch indicates an open situation, whereas a falling pitch indicates a closed situation. Intonation is used to show expectations. Strong expectations are shown by low or falling pitch, whereas lack of expectations is shown by high or rising pitch. The best example here is the use of the question tag.