Although the orator had a 3 page speech prepared and the audience was about to be subjected to a 20 minute speech, he looked at his watch, looked at the audience, and decided to be pithy and quick....
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...