"The house has been expensive to repair, so in retrospect it was not a wise purchase.""In retrospect, carrying the alligator by hand was not the best plan.""The experiment, as seen in retrospect, was...
Charles had good grades going into the final, but in retrospect it was easy to tell that he had never actually done his own homework. In retrospect, carrying the alligators by hand was not the best...
When it has a subject, verb, punctuation, capitalization, a predicate, and a complete thought. A sentence is a sentence when it is handed down by a judge (or a magistrate).
When it doesn't have a noun ( subject), a verb (the predicate) , no punctuation, when the first letter isn't capitalized and when it hasn't a complete thought. You need all of this to have a complete...