Unpacked L 4.1 f Standard: Demonstrate command of the conventions of Standard English grammar and usage when writing or speaking. f. Produce complete sentences, recognizing and correcting inappropriate fragments and run-ons. Unpacked: Fixing Sentence Fragments A sentence is a group of words that expresses a complete thought. David returned my baseball cards. A sentence fragment is a group of words that is written as a sentence but is missing a subject or predicate. A sentence fragment does not express a complete thought. My most valuable baseball cards. Sorted them into piles. A run---on sentence joins together two or more sentences that should be written separately. The boy found a raft the raft floated down the river. You can correct a run---on sentence by separating two complete ideas into two sentences. Each sentence should have a subject and a predicate. The boy found a raft. The raft floated down the river. You can also correct a run---on sentence by rewriting it as a compound or complex sentence. The boy found the raft after it floated down the river.