4th grade complex sentences worksheets

Fourth grade worksheets mix all three shapes in equal measure and add trickier complex sentences, including ones where the leaning part comes second. The three-way label forces a real decision: count the who-did-what pairs, then check whether one of them leans.

Free printable PDF worksheet, aligned to Common Core L.3.1.i.

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The kind of sentences you'll get

Read each sentence. Circle the letter of the label that fits.

  1. “The seeds sprouted in the paper cups.” This sentence is: . complex · simple · compound

    Answer: simple

  2. “The creek rose, so the rangers closed the trail.” This sentence is: . compound · complex · simple
  3. “Although the box was heavy, Maya carried it upstairs.” This sentence is: . simple · compound · complex

Every print pulls a fresh set of sentences at this level, so a make-up test or a second sibling never gets the same sheet.

What's on each sheet

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

The reliable routine: count the who-did-what pairs first. One pair is simple. Two pairs joined by comma plus and, but, or so is compound. Two pairs where one starts with a signal word is complex. Three questions, one label, every time.

Watch for: Kids treat because, when, and although as decoration. Those words are the signal: whatever they start cannot stand alone anymore. An opener like After lunch looks like a clause but has no who-did-what. A phrase opener keeps a sentence simple; a clause opener makes it complex.

Common questions about complex sentences

What changes when the leaning part comes second?
No comma, usually. We ate inside because the rain started is complex with no comma at all, so your child has to hear the leaning part rather than spot punctuation.
How should my child decide fast?
Count who-did-what pairs, then ask whether one leans. One pair: simple. Two independent: compound. One leaning on the other: complex. The key explains the label for every item.

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Aligned to Common Core L.3.1.i. Reviewed by the One more sheet team. Content version 178, updated August 2026.

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