English Grammar Worksheet for 12-Year-Olds — Complex Sentences & Punctuation Practice

Instructions

Part 1: Complex Sentences

A complex sentence is made up of an independent clause (a complete thought) and one or more dependent/subordinate clauses (an incomplete thought). These clauses are linked by a subordinating conjunction.

Write three original sentences using the conjunctions because, although, and when. After writing each sentence, underline the subordinate clause.

Example: Although it was raining, we decided to go out.

1. because:



2. although:



3. when:

Part 2: Punctuation Practice

Rewrite the sentence below, fixing all the capitalization and punctuation errors. There are 6 errors to find!

Sentence with errors:

“i think” said sophie “that we should go now its getting late”

Your corrected sentence:

Answer Key

Part 1: Complex Sentences

(Note: Your sentences will be different. These are just examples. Check to make sure your subordinate clause is underlined.)

1. because: The team celebrated because they had won the championship.
2. although: Although he was tired, he stayed up to finish his book.
3. when: My dog gets excited when I pick up his leash.

Part 2: Punctuation Practice

"I think," said Sophie, "that we should go now. It's getting late."