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http://learnscratch.org/index.php?option=com_content&task=view&id=170&It...

Scratch Video Course #1 Lesson #2
Course#1.Lesson 2 - Repeating Actions

In this lesson, you learn how to repeat an action forever, and how to start and stop a game by using the green flag and the red stop sign shape.

from learnscratch.org
Objective: To learn how to repeat actions and how to control them with the green flag and the stop sign.

Tutorial Part 1: Again and Again
Scratch Activity: Reproduce the actions in the tutorial. Experiment adding a second repeat block.

Tutorial Part 2: The Green Flag
Scratch Activity: Reproduce the actions in the tutorial. Experiment adding green flags to all repeat blocks.

Extensions:

Experiment with a second repeat block (for a second dancing sprite.)
Experiment playing sequences of multiple sounds again and again.
Experiment creating two or three repeat blocks and control them one by one, or all together with the green flag and the stop sign.

Additional explanations
Tutorial Part 1: Again and again
http://learnscratch.org/V/GS/GS_04.html
*Length: 2 and 1/2 minutes long
*Contents:
Start with the 4 blocks from the previous lesson.
Drag a forever block from the control menu into the script area
Drag the 4 connected blocks into the forever block

Tutorial Part 2: The Green Flag
http://learnscratch.org/V/GS/GS_05.html
*Length: 1 minute long
*Contents:
Start with the 5 blocks from the previous lesson.
Drag a green flag block from the control menu into the script area
Drag the green flag bock above the forever block
Now when you click the green flag above the play area, the sprite dances
If you click the red stop sign shape, the sprite stops dancing.