What is the trap on the third grade sheet?

Compound subjects and predicates. Maya washed and dried the dishes has two verbs but ONE who-did-what pair, so it is simple. Every sheet includes a few of these on purpose.

How can my child check an answer fast?

Cover one half of the sentence at the joining word and read each half alone. Both halves stand alone: compound. Either half falls over: simple.

3rd grade simple and compound sentences

3rd grade simple and compound sentences worksheets

Third grade worksheets add the classic trap: compound subjects and compound predicates. Ben and Leo share a locker is still a simple sentence, because both boys share one action. Your child labels each sentence, and the trap items are budgeted onto every sheet.

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 correct label.

“I like to swim, but the water is cold.” This is: . a simple sentence · a compound sentence
Answer: a compound sentence
“The wind blew hard, but the kite stayed up.” This is: . a simple sentence · a compound sentence
“The comet brightened, and the whole town watched.” This is: . a compound sentence · a simple sentence

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 3rd grade sheet

3rd grade sheets draw from 120 sentences, 10 to a page. All 60 of 2nd grade's sentences are here too, plus 60 more. 2nd grade sheets print 8 to a page.

A few of the sentences:

Leo built a tower of blocks.
The ferry docked, and the market opened its stalls.
The batter watched two strikes and swung at the third.

Choose the word. Read each sentence. Circle the letter of the correct label. 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 trap items are the lesson this year. When your child calls Ben and Leo share a locker compound, ask how many actions happened. Two people, one sharing: one who-did-what pair, so it is simple. Repeat with a compound predicate (The dog barked and howled) and the idea locks in.

Watch for: Kids see the word and anywhere and shout compound. The test is whether BOTH sides of the joining word could stand alone as sentences. Long does not mean compound. A simple sentence can carry many describing words and still have one who-did-what pair.

Common questions about 3rd grade simple and compound sentences

What is the trap on the third grade sheet?: Compound subjects and predicates. Maya washed and dried the dishes has two verbs but ONE who-did-what pair, so it is simple. Every sheet includes a few of these on purpose.
How can my child check an answer fast?: Cover one half of the sentence at the joining word and read each half alone. Both halves stand alone: compound. Either half falls over: simple.

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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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