To materialize is to appear from nothing. Here are some sentences. The Star Trek transporter causes people to materialize on the platform. The image will materialize as you heat the paper. The idea...
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).
A sentence is a complete clause with a subject and a finite verb. A sentence fragment is not a complete clause, but is part of a clause (often lacking the verb to make a full sentence). For instance,...