If your film contains dialogue or voiceover, you'll need a script. Here's an extract from a script.

Script and storyboard
       
how to...
 
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Remember that sound can be very important for information and mood. Think about sound from the beginning and include it in your scripts and storyboards.
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Scene 1 - at back of classroom
Jane: What's the matter?
Maria: I'm scared. Sadie says she's going to get us at breaktime.
(we see Sadie and Kate looking over at them)
Jane: (looking very scared) When the bell goes, we'd better get out of the class quick and go and hide.