What is a non subject opener?

A non-subject opener is a sentence starter that does not focus on the main subject of the sentence, often used to create interest or set the scene. Instead of beginning with the subject, it might start with an adverbial phrase, a question, or a descriptive clause. This technique can enhance writing by varying sentence structure and drawing the reader's attention. For example, starting with "Under the moonlight, the path seemed to shimmer" shifts the focus from the subject to the setting.