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.

4th grade complex sentences

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.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of sentences you'll get

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

“The recipe called for saffron, but the store had none.” This sentence is: . simple · compound · complex
Answer: compound
“If you water the seeds, they will sprout.” This sentence is: . simple · complex · compound
“Although the dog was tired, it chased the ball.” This sentence is: . simple · complex · compound

Every print pulls a new set of sentences at this level, so a make-up test or a second sibling gets a different mix.

What's on a 4th grade sheet

4th grade sheets draw from 120 sentences, 10 to a page. All 60 of 3rd grade's sentences are here too, plus 60 more.

A few of the sentences:

We baked cookies next door.
The baby napped, and Dad folded laundry.
By morning, the plows had cleared both lanes.

Choose the word. Read each sentence. Circle the letter of the label that fits. 10 questions per page.

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 4th grade 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.

Related worksheets

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Aligned to Common Core L.3.1.i. Reviewed by the One more sheet team. Content version 241, updated August 2026.

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