Commas in Compound Sentences Worksheet — Grade 7
Practice comma placement in compound sentences and compound verbs using coordinating conjunctions. Designed for Grade 7 analysis-level skills.
This worksheet targets one of the most frequently confused comma rules in middle school writing: knowing when to place a comma before a coordinating conjunction and when to leave it out. A compound sentence joins two independent clauses — each capable of standing alone — and always requires a comma before the coordinating conjunction. A sentence with a compound verb, however, has only one subject performing two actions, and no comma is needed. Getting this distinction right matters because it changes how a reader parses the sentence and affects the clarity of the writing. Students work through four sections, progressing from analysis of correctly punctuated sentences to independent writing, building both recognition and production of this essential punctuation rule.
Commas in Compound Sentences Worksheet — Grade 7
Apply what you know about coordinating conjunctions to decide when a comma belongs — and when it does not — in each sentence below.
Remember
- Use a comma before a coordinating conjunction (for, and, nor, but, or, yet, so) when it joins two independent clauses.
- Do NOT add a comma when the conjunction joins only two verbs sharing one subject — that is a compound verb, not a compound sentence.
- Test: cover the conjunction and check if both halves are complete sentences. If yes, add a comma. Example: She trained hard, but she lost.
Part A — Identify the Sentence Type
In each sentence, circle the coordinating conjunction and write CS (compound sentence) or CV (compound verb) on the line.
- 1.
Amara studied the map carefully, but she could not locate the ancient trade route on the page.
- 2.
The documentary crew traveled to the remote village and filmed the traditional ceremony for three days.
- 3.
Marcus had memorized the periodic table, yet he still struggled with balancing chemical equations in class.
- 4.
The volunteer organization collected donated supplies and distributed them to families across the flood-affected region.
- 5.
The council approved the budget proposal, so the renovation of the library could finally begin.
- 6.
Priya analyzed the survey data from three schools and presented her findings to the science committee.
Part B — Complete Each Sentence
Fill in each blank with the correct coordinating conjunction, adding a comma before it only when the sentence requires one.
- 7.
The gymnasium floor was refinished over spring break ____ students were not allowed to enter until Monday.
- 8.
The environmental club collected plastic bottles from the cafeteria ____ delivered them to the recycling center.
- 9.
Nathaniel had outlined his argument thoroughly before sitting down ____ his paragraphs still lacked supporting evidence.
- 10.
The student council president drafted the proposal during lunch ____ presented it to the principal after school.
- 11.
The novel had received a prestigious award last spring ____ most students found its dense prose challenging to read.
Part C — Correct the Punctuation
Each sentence has one comma error related to compound sentences or compound verbs — rewrite it correctly on the line.
- 12.
The librarian organized the new arrivals by genre and she recommended several titles to the reading club.
- 13.
The biology teacher explained the cell cycle, and demonstrated the process using an animated diagram on the board.
- 14.
The chess club had won the regional championship last year yet they struggled significantly at the state competition.
- 15.
Mei researched the historical background of the treaty, but did not include any primary sources in her bibliography.
- 16.
The spacecraft had traveled beyond the asteroid belt for six months but ground control had not received a signal.
Part D — Write Your Own Sentences
Write one original sentence following each prompt, using the correct comma rule for compound sentences or compound verbs.
- 17.
Write a compound sentence using the coordinating conjunction 'but,' making sure to place a comma correctly before it.
- 18.
Write a sentence with a compound verb using the coordinating conjunction 'and,' leaving out the comma before it.
Answer key
Part A — Identify the Sentence Type
- 1.but, CS
- 2.and, CV
- 3.yet, CS
- 4.and, CV
- 5.so, CS
- 6.and, CV
Part B — Complete Each Sentence
- 7., so
- 8.and
- 9., but
- 10.and
- 11., yet
Part C — Correct the Punctuation
- 12.The librarian organized the new arrivals by genre, and she recommended several titles to the reading club.
- 13.The biology teacher explained the cell cycle and demonstrated the process using an animated diagram on the board.
- 14.The chess club had won the regional championship last year, yet they struggled significantly at the state competition.
- 15.Mei researched the historical background of the treaty but did not include any primary sources in her bibliography.
- 16.The spacecraft had traveled beyond the asteroid belt for six months, but ground control had not received a signal.
Part D — Write Your Own Sentences
- 17.Example: The student council proposed a new recycling program, but the administration needed more time to review the plan.
- 18.Example: The track team trained every morning before school and competed in three meets during the month of October.
What this worksheet teaches
- Distinguish compound sentences from compound verbs to determine correct comma placement.
- Identify the independent clauses on each side of a coordinating conjunction accurately.
- Write original compound sentences and compound-verb sentences with correct punctuation.
Notes for the grown-up
- Students most often add a comma before 'and' in compound-verb sentences, treating any conjunction as a signal to pause.
- Have the student underline the subject of each clause: if only one subject governs both verbs, no comma is needed.
- When a student can correctly sort five novel sentences into compound-sentence or compound-verb with no prompting, move forward.
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