Conjunction Worksheet

A conjunction is a small word that joins two ideas, and the four coordinating conjunctions a fourth grader meets most often are and, but, or and so. Each one signals a different relationship: and adds, but contrasts, or offers a choice, and so points to a result. This Conjunction Worksheet asks students to read two complete sentences, decide how the ideas fit together, and then join them into one compound sentence with a comma before the conjunction. That comma is the part students forget, so every item on the page practices it.

The worksheet is built in two parts that move in opposite directions. In the first part, four pairs of short sentences sit under a word box holding and, but, or and so; students use each word exactly once, which means the relationship between the two ideas, not guesswork, decides the answer. In the second part, students work backward: they read a finished compound sentence and rewrite it as the two sentences it was built from, dropping the comma and the conjunction along the way. Print this conjunction worksheet for morning work, use it in a grammar center, or send it home for extra practice. An answer key is included on the last page, so checking the work takes seconds.

What’s Included

• One printable Conjunction Worksheet in PDF format, ready to print
• A word box with the four coordinating conjunctions and, but, or and so
• Part A: four sentence pairs to combine into compound sentences
• Part B: two compound sentences to split back into two sentences each
• A complete answer key on the final page
• Name and date lines at the top of the page

Three Reasons This Helps Kids

• Using each conjunction only once forces students to read for meaning instead of picking the first word that sounds right.
• Writing the whole sentence out, rather than circling a word, builds the comma habit that carries into their own writing.
• Taking a compound sentence apart shows students that both halves really are complete sentences on their own.

Ideas for Teachers and Parents

• Ask students to read their finished sentences aloud and listen for the small pause the comma creates.
• Challenge a partner to swap one conjunction for another and explain how the meaning changes.
• Hunt for compound sentences in a chapter book and mark the comma and the conjunction with a sticky note.
• Pair this 4th grade conjunctions worksheet with a subject and predicate activity so students can name both halves of the sentences they just joined.

Related Resources

• Using Conjunctions Worksheet
• Subordinating Conjunctions Worksheet
• Combining and Expanding Sentences Worksheet
• Subject and Predicate Song