A shift in thought can be indicated by what is called an em dash. An em dash is used to set of an interruption that is closely relevant to
the sentence but is not grammatically part of it. These set of
interruptions can be found in a list, illustration, restatement, shift
in thought or tone, summary, or dramatic point. Hope this helps, if you need anymore help or further explanation just let me know!! :)
in third person omniscient narration the narrator has a gods eye view of the story and is privy to all characters thoughts as well as knowledge of the past and future. Then there's third person limited when the narrators innately tied to it then that's how you will know.
