What is Missing? Complete Incomplete Sentences Worksheet

A complete sentence needs two parts working together: a subject that names who or what the sentence is about, and a predicate that tells what the subject is or does. When one of those parts is left out, the words form a fragment instead of a sentence, and readers are left wondering what happened. Learning to spot the gap is the first step toward fixing it. The What is Missing? Complete Incomplete Sentences Worksheet gives 3rd graders focused practice at noticing exactly which part of a sentence has gone missing, then supplying words that make the thought whole again.

This printable worksheet moves from recognizing to repairing. In the first section, students read five groups of words and fill in a bubble to show whether the subject or the predicate is missing. In the second section, they pull a group of words from the word box and write it on the line so each sentence finally makes sense. Because it works as a warm-up, a center rotation, a homework page, or a quick check before a grammar unit test, this What is Missing? Complete Incomplete Sentences Worksheet fits almost anywhere in the week. Teachers looking for a slightly easier version can pair it with a 2nd grade sentences worksheet first.

What’s Included

• 1 print-ready PDF worksheet
• Answer key
• 5 fill-in-the-bubble fragment activities and 3 word-box sentence-completion activities

This resource helps children learn the skill in three ways. First, the bubble questions force a decision rather than a guess, so students must name the missing part instead of simply sensing that something sounds wrong. Second, the word box lowers the writing load, which keeps attention on sentence structure rather than on spelling. Third, the two sections build on each other, so a child who identifies a missing predicate in the first half immediately practices adding one in the second half. Together they turn an abstract grammar rule into something students can see and correct on the page.

Teachers and parents can extend the lesson in playful ways. Write subjects on green cards and predicates on blue cards, then let students mix and match them to build silly sentences and read the funniest ones aloud. Cover part of a sentence in a favorite picture book with a sticky note and ask what is missing. During writing conferences, have children highlight the subject and underline the predicate in their own drafts to catch fragments before they turn work in. A quick clean-up hunt through classroom signs or cereal boxes also shows how often real-world writing uses fragments on purpose.

Related Resources

• Subject Predicate Worksheet
• Rewriting Subject Predicate Sentences Worksheet
• Rewriting Incomplete Sentences Worksheet
• Subject and Predicate Song (Have Fun Teaching)