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).
1) The meeting will convene in twenty minutes, after which, the group will convene in the cafeteria for refreshments.2) The CEO called a meeting for all top managers to convene in the conference room...
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...