This simple, compound, and complex sentences worksheet helps 4th grade students identify and combine sentence types using clauses and conjunctions. Includes a complete answer key for fast, no-prep grammar practice at home or school.
This conjunction worksheet gives 4th Grade students eight sentences to build and take apart, practicing the comma that goes before and, but, or and so, with an answer key included for fast checking.
Fourth graders use conjunctions to build stronger sentences. They join two complete sentences with a comma and a coordinating conjunction (for, and, nor, but, or, yet, so): I wanted to play outside, but it was raining. They also use subordinating conjunctions like because, although, when and since to make complex sentences: Because it was raining, we played inside. Along the way they learn to fix run-ons and fragments. The click comes when a student turns two choppy sentences into one smooth one and hears how much better it sounds.
Our favorite ways to make conjunctions stick
Fourth graders write a lot. These moves get conjunctions into their writing, not just their worksheets.
Simple, compound, complex
Write one simple sentence on the board. Then build a compound version with "but" and a complex version with "although." Read all three aloud and ask which sounds best in a story. Modeling the upgrade shows kids why conjunctions matter.
Why it works: showing first, practicing together, then letting kids try alone is the "gradual release" model teachers have relied on for decades (Pearson and Gallagher, 1983).
Give sentences with a blank and three choices, like and, but or so. Kids choose and explain why the meaning works. A quick daily round shows you who understands that "but" means a contrast.
Why it works: pulling an answer out of memory makes it stick far better than rereading it, one of the strongest findings in learning research (Dunlosky and colleagues, 2013).
Pull two short sentences from a student's draft (with permission) and combine them together as a class. Then kids find two of their own to join. Real writing makes it stick better than any made-up example.
Why it works: the U.S. Department of Education's guide for teaching elementary math recommends moving from hands-on objects to drawings to numbers.
Conjunctions are words that join words, phrases or sentences. Fourth graders use coordinating conjunctions like and, but and so to make compound sentences, and subordinating conjunctions like because and although to make complex sentences.
What does FANBOYS stand for?
FANBOYS is a memory trick for the seven coordinating conjunctions: for, and, nor, but, or, yet, so. When one joins two complete sentences, put a comma before it.
What is the difference between a compound and a complex sentence?
A compound sentence joins two complete sentences with a coordinating conjunction. A complex sentence joins a complete sentence with a dependent clause using a word like because, when or although.
How do conjunctions fix run-on sentences?
A run-on jams two sentences together without the right punctuation. Adding a comma and a conjunction, like ", so," or turning one part into a "because" clause, fixes it.
Written by the Have Fun Teaching team of elementary teachers and homeschoolers. Research: Pearson, P. D., & Gallagher, M. C. (1983). The instruction of reading comprehension. Contemporary Educational Psychology, 8(3). Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving Students' Learning With Effective Learning Techniques. Psychological Science in the Public Interest, 14(1). U.S. Department of Education, What Works Clearinghouse (2021). Assisting Students Struggling with Mathematics: Intervention in the Elementary Grades.
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