GrammarSheetsMake a worksheet
Browse by grade:KindergartenGrade 1Grade 2Grade 3Grade 4Grade 5Grade 6Grade 7Grade 8
Grade 8Complex SentencesAnalysis

Complex Sentences: Dependent Clauses and Punctuation — Grade 8

Grade 8 worksheet drilling dependent clause identification, comma placement in complex sentences, and error correction across 20 exercises.

A complex sentence joins one independent clause to at least one dependent clause, and the comma rule depends entirely on which clause opens the sentence. When the dependent clause comes first, a comma separates it from the independent clause. When the independent clause leads, no comma is needed before the dependent clause that follows. This worksheet gives Grade 8 students practice in all three moves: recognizing dependent clauses in real academic sentences, choosing the correct punctuation in a multiple-choice format, and editing flawed sentences to correct comma errors. The final section asks students to write their own complex sentences from scratch, showing that they can apply the rule without a model. Use the sheet as a guided lesson, a review activity, or a formative assessment.

Complex Sentences: Dependent Clauses and Punctuation — Grade 8

This worksheet focuses on complex sentences and their dependent clauses. Work through each section to sharpen your ability to identify, punctuate, and write them.

Remember

  • A complex sentence has one independent clause and at least one dependent clause joined by a subordinating conjunction.
  • When the dependent clause comes first, place a comma after it. Example: 'Although it rained, we stayed.'
  • When the dependent clause follows the independent clause, no comma is needed. Example: 'We stayed because it rained.'

Part A — Find the Dependent Clause

Underline the dependent clause in each complex sentence.

  1. 1.

    Although the science project required three weeks of careful preparation, Amara submitted it ahead of the deadline.

  2. 2.

    The council rejected the proposal because the budget figures did not account for construction delays.

  3. 3.

    Before the debate team could practice their arguments, the coach reviewed their research sources carefully.

  4. 4.

    Tariq reads historical nonfiction whenever he wants to understand a current event more deeply.

  5. 5.

    Even though the hiking trail was clearly marked on the map, the group lost its way twice.

  6. 6.

    The librarian organized the reference section so that students could locate primary sources without assistance.

Part B — Choose the Correct Option

Choose the answer that correctly applies the punctuation rule for complex sentences.

  1. 7.

    Which sentence correctly punctuates a complex sentence with a fronted dependent clause?

    1. a)Because the auditorium was under renovation, the concert moved to the gymnasium.
    2. b)Because the auditorium was under renovation the concert moved to the gymnasium.
    3. c)The concert moved to the gymnasium, because the auditorium was under renovation.
  2. 8.

    Which sentence correctly punctuates a complex sentence with a trailing dependent clause?

    1. a)Marcus will present his findings if the department head approves the schedule.
    2. b)Marcus will present his findings, if the department head approves the schedule.
    3. c)Marcus will present his findings; if the department head approves the schedule.
  3. 9.

    Which of the following is a complex sentence, not a compound sentence?

    1. a)The film received strong reviews, and the director earned several award nominations.
    2. b)The film received strong reviews although critics debated its historical accuracy.
    3. c)The film received strong reviews, but the director earned only one award nomination.
  4. 10.

    Which word can begin the dependent clause: '____ the panel reviewed all evidence, a decision was reached'?

    1. a)After
    2. b)However
    3. c)Therefore
  5. 11.

    Which sentence correctly uses a complex sentence structure with proper punctuation?

    1. a)If you submit your portfolio by Friday, the instructor will provide detailed feedback.
    2. b)If you submit your portfolio by Friday the instructor will provide detailed feedback.
    3. c)You submit your portfolio by Friday, if the instructor will provide detailed feedback.
  6. 12.

    Which sentence correctly removes a comma that should not appear before a trailing dependent clause?

    1. a)Joaquin practiced the composition daily so that he could perform it from memory.
    2. b)Joaquin practiced the composition daily, so that he could perform it from memory.
    3. c)So that he could perform it from memory Joaquin practiced the composition daily.

Part C — Fix the Punctuation Error

Each sentence has one punctuation error involving a dependent clause; rewrite it correctly on the line provided.

  1. 13.

    When the laboratory results confirmed the hypothesis the researchers celebrated their breakthrough.

  2. 14.

    Sofia received a full scholarship, because she demonstrated exceptional achievement in mathematics.

  3. 15.

    Although the documentary was nearly two hours long it held the audience's attention throughout.

  4. 16.

    Students may use calculators on the final exam, unless the teacher posts a different policy first.

  5. 17.

    Since the community center opened its expanded wing three years ago attendance has nearly doubled.

  6. 18.

    Nadia studied the trail map carefully, because the route through the mountain pass had several forks.

Part D — Write Your Own

Follow each prompt to write your own complex sentence, using the correct punctuation.

  1. 19.

    Write a complex sentence with the dependent clause first; include the correct comma after it.

  2. 20.

    Write a complex sentence where the independent clause comes first; do not place a comma before the dependent clause.

Answer key

Part A — Find the Dependent Clause

  1. 1.Although the science project required three weeks of careful preparation
  2. 2.because the budget figures did not account for construction delays
  3. 3.Before the debate team could practice their arguments
  4. 4.whenever he wants to understand a current event more deeply
  5. 5.Even though the hiking trail was clearly marked on the map
  6. 6.so that students could locate primary sources without assistance

Part B — Choose the Correct Option

  1. 7.Because the auditorium was under renovation, the concert moved to the gymnasium.
  2. 8.Marcus will present his findings if the department head approves the schedule.
  3. 9.The film received strong reviews although critics debated its historical accuracy.
  4. 10.After
  5. 11.If you submit your portfolio by Friday, the instructor will provide detailed feedback.
  6. 12.Joaquin practiced the composition daily so that he could perform it from memory.

Part C — Fix the Punctuation Error

  1. 13.When the laboratory results confirmed the hypothesis, the researchers celebrated their breakthrough.
  2. 14.Sofia received a full scholarship because she demonstrated exceptional achievement in mathematics.
  3. 15.Although the documentary was nearly two hours long, it held the audience's attention throughout.
  4. 16.Students may use calculators on the final exam unless the teacher posts a different policy first.
  5. 17.Since the community center opened its expanded wing three years ago, attendance has nearly doubled.
  6. 18.Nadia studied the trail map carefully because the route through the mountain pass had several forks.

Part D — Write Your Own

  1. 19.Example: Although rainfall last month was below average, the reservoir maintained its level through careful conservation.
  2. 20.Example: The student council extended the deadline because candidates needed more time to gather petition signatures.

What this worksheet teaches

  • Identify the dependent clause in a complex sentence and name the subordinating conjunction.
  • Explain which comma rule applies based on where the dependent clause sits in the sentence.
  • Write original complex sentences that correctly attach and punctuate a dependent clause.

Notes for the grown-up

  • Students often omit the comma after a fronted dependent clause; this is the most frequent error you will see in Section C.
  • When students add a comma before a trailing 'because' clause, redirect them to the rule: no comma when the main clause leads.
  • A student is ready to advance when they write complex sentences from scratch and explain comma placement without prompting.

Practise this next

Grade 4Sentence Structure

Run-on Sentences and Comma Splices Worksheet — Grade 4

Practice spotting and fixing run-on sentences and comma splices in this Grade 4 worksheet on sentence structure and joining independent clauses.

15 questions· Run-on Sentences and Comma SplicesPrint PDF →
Grade 6Sentence Structure

Compound Sentences: Comma and Coordinating Conjunction — Grade 6

Grade 6 grammar worksheet that drills joining two independent clauses with a comma and a coordinating conjunction to form compound sentences.

18 questions· Compound SentencesPrint PDF →
Grade 4Sentence Structure

Simple Sentences: One Independent Clause — Grade 4

This Grade 4 worksheet drills simple sentences — including those with compound subjects and compound verbs — through four types of practice exercises.

15 questions· Simple SentencesPrint PDF →
Grade 2Sentence Structure

Subjects and Predicates Worksheet — Grade 2

Grade 2 students identify the complete subject, complete predicate, and simple subject in short, everyday sentences on this printable sheet.

12 questions· Subjects and PredicatesPrint PDF →
Grade 1Sentence Structure

Complete Sentences and Fragments Worksheet — Grade 1

This Grade 1 practice sheet helps students recognize complete sentences, identify subjects, and complete sentence fragments by filling in missing verbs.

10 questions· Complete Sentences and FragmentsPrint PDF →
Grade 8Pronoun Usage

Pronouns in Compound Subjects and Objects — Grade 8

Grade 8 pronoun worksheet focused on choosing I versus me and he versus him in compound subjects and objects by isolating each pronoun to test its case.

20 questions· Pronouns in Compound Subjects and ObjectsPrint PDF →