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Fragments, Run-Ons and Clauses

A 40-minute Grade 4 lesson on relative pronouns, progressive tenses and correcting sentence fragments and run-ons.

Fragments, Run-Ons and Clauses is a free 40-minute Grade 4 English lesson plan for Common Core standard L.4.1 — use relative pronouns, progressive verbs, modal auxiliaries and correct adjective order. It is timed across 5 sections, gives the exact wording to use where the wording carries the meaning, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.

Grade:
Grade 4
Length:
40 minutes
Standard:
L.4.1

Grade 4 · Language

L.4.1

Demonstrate command of the conventions of standard English grammar and usage when writing or speaking.

Objective

Students will be able to identify a fragment or a run-on by testing for complete thoughts, correct it in two structurally different ways, and use a relative pronoun (who, which, that) to join two clauses.

Students are successful when they can

  • Labels each of 8 sentences as fragment, run-on or correct, and names which of the three tests a fragment fails.
  • Corrects one fragment by adding the missing part and by attaching it to a neighboring sentence.
  • Corrects one run-on by splitting it with a period and by joining it with a comma plus a conjunction.
  • Combines two sentences into one using who, which or that without repeating the shared noun.

What you need

  • Four warm-up cards: "The dog barked." / "Because the bus was late." / "Running down the hill." / "Mia ran."
  • A sheet of 8 faulty and correct sentences (Guided practice) per pair
  • Relative pronoun cards: who, which, that
  • The printable practice sheet linked at the end of this plan

The lesson

Warm-up — three tests

5 min
  1. Write the three tests on the board and leave them up all lesson: "1. Who or what is it about? (subject) 2. What do they do or what is happening? (verb) 3. Could I say it to someone and they would not ask 'and then what?' (complete thought)."
  2. Hold up the four cards one at a time: "The dog barked." / "Because the bus was late." / "Running down the hill." / "Mia ran." For each, take a thumbs up (sentence) or thumbs down (fragment).
  3. Expected: "The dog barked." and "Mia ran." pass all three. "Because the bus was late." has a subject and verb but fails test 3 — ask "Because the bus was late... what happened?" "Running down the hill." fails test 1: who was running?
  4. Point at "Mia ran." deliberately. It is the shortest card and it is a complete sentence. This is the card that heads off the "short means fragment" belief before it forms.
“A fragment is not a short sentence. It is a sentence with a piece missing. "Mia ran" is two words and nothing is missing.”

Teach — two fixes each

13 min
  1. Write: "We stayed inside. Because it was raining." Underline the fragment. Fix 1 — add what is missing: "It was raining." (delete "because"). Fix 2 — attach it: "We stayed inside because it was raining."
  2. Ask: "Do these two fixes say the same thing?" Answer to fish for: no — fix 1 gives two separate facts, fix 2 tells you the rain is the reason. The writer chooses the one they meant.
  3. Write the run-on: "The bell rang everyone ran to the door." Ask how many complete thoughts there are (two: "the bell rang" and "everyone ran to the door") and how many joins (none). That is the definition of a run-on: two complete thoughts with no proper join.
  4. Fix 1 — split: "The bell rang. Everyone ran to the door." Fix 2 — join with a comma and a conjunction: "The bell rang, so everyone ran to the door." Read both aloud. The second makes the bell the cause.
  5. Write the comma splice "The bell rang, everyone ran to the door." and cross it out. Say a comma on its own is not strong enough to hold two sentences together; it needs a conjunction with it (and, but, so, or) or a period instead.
  6. Relative pronouns: write "My aunt lives in Leeds. My aunt keeps bees." Combine: "My aunt, who lives in Denver, keeps bees." Then "The kite was red. The kite got stuck in a tree." becomes "The kite that got stuck in a tree was red." Board note: "who = people, which/that = things."
  7. Ask what the relative pronoun made possible. Answer: we said "my aunt" once instead of twice, and one sentence now does the work of two.
“Every fix is a choice. Two fixes, and they are not the same sentence. Read them both and choose the one you meant.”

Guided practice — fix eight

12 min
  1. Give pairs the eight sentences: 1 "After the match ended." 2 "Sam likes math he is good at it." 3 "The puppy slept." 4 "Jumping into the pool." 5 "I finished my book, I started another." 6 "Ella was reading while her brother was practicing the drums." 7 "Which was the best part of the day." 8 "My cousin plays the violin she practices every night."
  2. For each, pairs write F (fragment), R (run-on) or C (correct). Then they fix every F and R two ways and star the fix they prefer, with a reason in five words or fewer.
  3. Key: F = 1, 4, 7; R = 2, 5, 8; C = 3 and 6. Number 6 is long and correct; it uses two past progressive verbs ("was reading," "was practicing") joined by "while." Number 3 is short and correct. Both are there to catch pairs who judge by length.
  4. Circulate and ask pairs who mark 6 as a run-on: "How many complete thoughts, and what joins them?" They should find "while" doing the joining.
  5. For number 8, push for a relative pronoun fix: "My cousin, who practices every night, plays the violin."
“Before you mark it, count: how many complete thoughts, and what is holding them together?”

Independent practice

8 min
  1. Students complete the sentences page, which mixes fragments, run-ons and correct sentences.
  2. Before starting, each student writes the three tests at the top of the page from memory. If they cannot, they copy them from the board; that tells you who needs the support group.
  3. Collect three run-on fixes from different students to use in the close.

Close

2 min
  1. Write: "When the lights went out." Take one fix that adds the missing part ("The lights went out.") and one that attaches it ("We screamed when the lights went out.").
  2. Ask which test it failed. Answer: test 3 — it has a subject and verb but leaves you waiting.

What goes wrong, and why

Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.

Fixes a run-on with a comma alone: "I was hungry, I ate an apple."

Why: A comma marks a pause, and students hear a pause between the two thoughts. They have been told commas go where you breathe, so a pause plus a comma feels like the rule being followed exactly.

Fix: Write "I was hungry, I ate an apple." and "I was hungry, so I ate an apple." side by side. Cover the comma in the first and ask what is joining the two sentences — nothing but a breath. Teach "comma + and/but/so" as one unit that travels together.

Calls any short sentence a fragment, marking "The puppy slept." as F.

Why: Most fragments they have seen corrected are short, so length has become the signal. They are judging the shape on the page, not testing what is there.

Fix: Make them run the three tests aloud on "The puppy slept.": who? the puppy; doing what? slept; complete? yes. Then show a long fragment, "Because the puppy that we brought home from the farm last week slept all afternoon.", and run the same tests.

Calls any long sentence a run-on, marking sentence 6 ("Ella was reading while...") as R.

Why: "Run-on" sounds like "runs on too long," so the name itself teaches the error. Long sentences in their own writing have often been run-ons, which confirms it.

Fix: Redefine on the board: "run-on = two complete thoughts + no proper join." Have them box each complete thought in sentence 6 and circle the joining word ("while"). One join for two thoughts means it is correct, however long.

If they are not there yet

  • Give a fix frame for run-ons: "____. ____." and "____, so ____." so the two structures are on the page and students choose and fill rather than invent.
  • Work on fragments only first, using just the "because" and "-ing" kinds from the warm-up, and add run-ons once the three tests are automatic.
  • Provide the eight sentences with the complete thoughts already underlined, so the student's job is counting the joins rather than finding the clauses.

If they finish early

  • Fix the run-on "The storm was coming we packed up the tent." three ways: split, comma plus conjunction, and with a subordinating word ("As the storm was coming, we packed up the tent."). Explain which sounds most urgent.
  • Write a two-word fragment a good author might use on purpose, such as "Then silence." at the end of a scary paragraph, and explain in one sentence why the missing verb is the effect.
  • Combine three sentences into one with two relative pronouns: "The boy found a key. The boy lives next door. The key opened the old shed." (Target: "The boy who lives next door found a key that opened the old shed.")

Exit ticket

Fix this run-on two different ways: "The rain stopped we went outside." Star the fix you prefer and say why.

What to look for: "The rain stopped. We went outside." and "The rain stopped, so we went outside." (or "When the rain stopped, we went outside."). A comma alone means restate comma-plus-conjunction. Two full-stop versions with different words means they think a fix is rewording, not restructuring.

Printable practice for L.4.1

Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.

Questions about Fragments, Run-Ons and Clauses

How long does the Fragments, Run-Ons and Clauses lesson take?

40 minutes, split across 5 timed sections: warm-up 5 min, teach 13 min, guided practice 12 min, independent practice 8 min, close 2 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.

Which standard does Fragments, Run-Ons and Clauses teach?

CCSS.ELA-LITERACY.L.4.1 — L.4.1, Language for Grade 4: “Demonstrate command of the conventions of standard English grammar and usage when writing or speaking.” In plain terms, use relative pronouns, progressive verbs, modal auxiliaries and correct adjective order.

What do I need to teach this lesson?

Four warm-up cards: "The dog barked." / "Because the bus was late." / "Running down the hill." / "Mia ran.", a sheet of 8 faulty and correct sentences (Guided practice) per pair, relative pronoun cards: who, which, that and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.

What mistakes should I expect in this lesson?

Three, each a reasoning error rather than carelessness: fixes a run-on with a comma alone: "I was hungry, I ate an apple."; calls any short sentence a fragment, marking "The puppy slept." as F and calls any long sentence a run-on, marking sentence 6 ("Ella was reading while...") as R. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.

How do I know whether the lesson worked?

The exit ticket asks: “Fix this run-on two different ways: "The rain stopped we went outside." Star the fix you prefer and say why.” "The rain stopped. We went outside." and "The rain stopped, so we went outside." (or "When the rain stopped, we went outside."). A comma alone means restate comma-plus-conjunction. Two full-stop versions with different words means they think a fix is rewording, not restructuring. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.

Is there a worksheet to go with Fragments, Run-Ons and Clauses?

Yes — 1 printable L.4.1 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.

Is Fragments, Run-Ons and Clauses free to use?

Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on October 8, 2026. Please do not resell it or republish it as your own.

Last reviewed 2026-10-08. Aligned to L.4.1 of the Common Core State Standards for English Language Arts.