Foreshadowing - Foreshadowing is to suggest what's going to happen in the future. At the start of the play, we don't know that Gerald had an affair, or that Sheila had already suspected it. So the stage directions half playful half serious gives a very early hint to the audience members who are really paying attention that something's not quite right with Sheila and Gerald. All the dramatic choices that precede makes it so the form, the structure and the language of An Inspector Calls have a real impact on how the audience experiences the play.