Subjects and predicates Worksheets

These complete sentences worksheets are designed for 4th Grade students (Ages 9-10). Print any one in the set for targeted practice, or download them together as a packet.

Yes. These worksheets work for homeschool, classroom, and tutoring. Use them as a morning warm-up, an independent center activity, or a fast-finisher task.

Fourth graders should write complete sentences and fix the two errors that break them: fragments and run-ons (CCSS L.4.1f). By the end of the year, your fourth grader can find the complete subject and complete predicate, tell the difference between a fragment, a run-on, and a full sentence, and repair each one. They learn to join short, choppy sentences into one clear sentence using a comma and a coordinating conjunction (L.4.2c), and to build compound subjects and predicates so their writing flows. Fourth grade also adds sentence variety: classifying the four sentence types (declarative, interrogative, imperative, exclamatory), starting sentences different ways, adding an introductory clause with a comma, and choosing precise words for effect (L.4.3a). They practice subject-verb agreement, including the tricky cases where a phrase sits between the subject and the verb, and they clean up double negatives. The goal is not just correct sentences but varied, purposeful ones. Worksheets that move from spotting fragments and run-ons to combining, expanding, and classifying sentences give students the repeated, targeted practice these standards expect.

Start by making the definitions concrete. A fragment is missing a subject or a predicate, so it cannot stand alone. A run-on jams two complete thoughts together with no punctuation or joining word. Show both next to a correct sentence so your fourth grader can hear the difference by reading aloud: a run-on leaves you breathless, and a fragment leaves you hanging. Then teach the three fixes for a run-on: split it into two sentences with a period, join the two parts with a comma and a coordinating conjunction like and, but, or so (CCSS L.4.2c), or add a subordinating conjunction such as because. For fragments, have students name what is missing, the who or the what is happening, and add it. The most reliable sequence is spot it, name the error, then fix it, because students who can label the problem repair it far more consistently than students who only guess. Worksheets that mix fragments, run-ons, and correct sentences in one exercise, and ask students to rewrite each incorrect one, build the editing habit that CCSS L.4.1f is really after. Reading the corrected sentence aloud is the final check.

Fourth graders make four sentence errors most often. First, run-ons: two complete thoughts joined with only a comma (a comma splice) or with nothing at all, as in "It was raining we stayed inside." Second, fragments: a group of words missing a subject or a verb that gets punctuated like a full sentence, as in "Because the bus was late." Third, subject-verb agreement slips, especially when a phrase separates the subject from the verb ("The box of markers is on the desk," not "are"). Fourth, double negatives, such as "I do not have no pencil," where two negative words cancel each other out. A fifth, milder issue is sameness: starting every sentence the same way and never combining short ones, which makes writing choppy. Each error has a clean fix, and CCSS L.4.1f expects students to produce complete sentences and correct both fragments and run-ons. Worksheets that target one error at a time, then finish with a proofreading passage that mixes all of them, help students build both specific knowledge and the general editing awareness they need to catch these mistakes in their own writing.