Grammar: Clauses, Phrases, and Complex Sentence Structures

A clause is a group of words that has a subject and a verb. Some clauses can stand alone as a sentence. Others cannot — they need to lean on another clause to make sense. Strong fifth-grade writers use both kinds together to build complex sentences that show how ideas connect.

Independent Clauses — Complete Thoughts

• An independent clause has a subject and a verb and expresses a complete thought.
• It can stand on its own as a full sentence.
• Examples: "She runs every morning." / "The cat slept on the rug."
• Two independent clauses joined by a comma and a coordinating conjunction (and, but, or, so) form a compound sentence.

Dependent Clauses — Incomplete Thoughts

• A dependent clause also has a subject and a verb, but it does NOT express a complete thought on its own.
• It usually starts with a subordinating conjunction such as because, when, although, if, since, after, or unless.
• Examples: "Because she trains hard" / "When the lights went out" — both leave the reader hanging.
• A dependent clause must be attached to an independent clause to make a full sentence.

Building Complex Sentences

1. Pick two related simple sentences (two independent clauses).
2. Choose a subordinating conjunction that fits the relationship — time (when, after, before), reason (because, since), or condition (if, unless).
3. Add the conjunction to one clause to turn it into a dependent clause.
4. Join the dependent clause to the remaining independent clause to form a complex sentence.

Punctuating Complex Sentences

• When the dependent clause comes FIRST, put a comma after it: "When the rain stops, we will play."
• When the independent clause comes first, you usually do NOT need a comma: "We will play when the rain stops."
• Never leave a dependent clause alone — that creates a fragment.