Grammar Explanations, Exercises and Worksheets: Complex Sentences

Keep Calm and Use Complex Sentences


In grammar, a complex sentence is a sentence with one independent clause and at least one dependent clause. A complex sentence is often used to make clear which ideas are most important, and which ideas are subordinate.

Complex Sentence Examples

“I ate the meal that you cooked.” In this example, “I ate the meal” is an independent clause, while “that you cooked” is a relative clause. The independent clause could stand alone as a simple sentence without the relative clause.

“I enjoyed the apple pie that you bought for me.” Here, “I enjoyed the apple pie” is an independent clause and “that you bought for me” is a relative clause.

“I ate breakfast before I went to work.” This has “I ate breakfast” as an independent clause, and “before I went to work” as a dependent clause.


Complex Sentences Exercises

  1. I’m going to the Supermarket_______ I need to buy some groceries
  2. I prepared dinner _________ I got home.
  3. She decided to trust Mike  ________ he was a reliable guy.
  4. _______ we went to school, she decided to investigate the issue.
  5. Lisa decided to break up with Tom _________ he was too worried about his career.
  6. John bought a new car __________ he had received one as a gift last week.
  7. Derek days that there will be a problem _______ he doesn’t bring the car back.
  8. Sara will have finished the homeowrk ________ the time you get here
  9. ________ it’s raining, she’s going for a walk.
  10. ________ she passes her final exam, she will fail the class.


  • while
  • after
  • though
  • because
  • as soon as
  • whereas
  • wherever
  • when
  • before
  • as
  • so that
  • unless
  • since
  • although
  • if
  • until
  • where
  • even though
  • whether


  1. Compound and Complex Sentences
  2. Complex Sentences Exercises
  3. Complex Sentences Worksheets
  4. Complex Sentences Online Exercise