>  If they are inside an establishment and the camera is outside, filming
> them through a window, you expect not to hear what they are saying?

Depends on what the shot is trying to achieve.  Both possibilities are used 
a lot in actual movies.

A short 2 second shot from outside with audio from inside is used to show 
the viewers where the subjects are, followed immediately by a shot inside 
the building.  The other option is to have the audio from outside, usually 
this type of shot lasts longer and is used to emphasise that what is going 
on inside isn't known to the outside, or vice-versa.  Or it might be used to 
emphasise that some very loud noise from inside is audible from outside.  Or 
to show how peaceful it is outside compared to inside, or vice-versa.  I'm 
sure there's more purposes too.

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