A phrase is a group of words that lacks a subject, a verb, or both. If you punctuate a phrase as a sentence (with a capital letter and a period), you create a fragment.
Fragmented phrases are often prepositional phrases or verbal phrases; sometimes they are appositives, words or word groups that rename nouns or pronouns.
Fragmented phrases can be fixed in one of two ways:
A sentence can have a compound predicate, with two or more predicate phrases joined by a coordinating conjunction. Because the parts of a compound predicate have the same subject, they should appear in the same sentence.
The compound predicate is selects . . . and uses. . . . Notice that no comma appears between the two parts of a compound predicate.
Exercise: Sentence fragments 1
Exercise: Sentence fragments 2
Exercise: Sentence fragments 3
Exercise: Sentence fragments 4
Exercise: Sentence fragments 5
Related topic:
Punctuation of compound predicates
prepositional phrase A phrase beginning with a preposition and ending with a noun or noun equivalent (called the object of the preposition): on the horizon.
verbal phrase A verbal plus its objects or modifiers.
appositive A noun or noun phrase that renames a nearby noun or pronoun: Bailey, the representative from Alabama, voted for the bill.
compound predicate Two verbs or verb phrases joined with a coordinating conjunction in one clause and sharing one subject.
predicate A verb and its objects, complements, and modifiers.
coordinating conjunction and, but, or, nor, for, so, yet; used to join elements of equal grammatical form.