3rd Grade Subordinating Conjunctions Worksheets
Subordinating conjunctions (because, although, until, before, after, while, if) attach a helper idea to a main idea and label the connection: reason, surprise, time, or condition. Third graders choose the one whose label matches the logic of the sentence.
Free printable PDF, aligned to Common Core L.3.1.h. One skill per page, answer key on page two.
Every sheet is one of a kind and prints with a version code, so you can reprint the exact same one later. New version every click.
The kind of sentences you'll get
Circle the letter of the joining word the sentence's logic needs.
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The bakery sold out ______ the article praised its bread.
until · although · because
Answer: because
- ______ the gym was being painted, recess moved outside. Because · Until · Although
- The crossing guard waits ______ every child reaches the curb. because · although · until
Every print draws a fresh mix of sentences at this level, so a make-up test or a second sibling gets a different sheet.
What's on each sheet
- Choose the word. Circle the letter of the joining word the sentence's logic needs. 10 questions per page.
Every version prints on US Letter or A4, with its answer key on the last page.
How to teach this
Give each conjunction a job title: because is the reason-giver, although is the surpriser, until/before/after are the time-keepers, if is the deal-maker. Then have students read the two halves of the sentence and name the relationship out loud before choosing. Naming first cuts errors dramatically, exactly as with and/but/or a year earlier.
Watch for: Each conjunction names a different relationship, so they aren't swappable: because gives a reason, although signals a surprise, until marks time. Starting a sentence with because is fine, as long as the main idea follows: 'Because it rained, we stayed in.'
Common questions about subordinating conjunctions
- What's the difference between coordinating and subordinating conjunctions?
- Coordinating ones (and, but, or, so) join two equal ideas. Subordinating ones (because, although, until, if) attach a helper idea that leans on the main one. Kids don't need the terminology as much as the feel: the subordinating word always introduces the leaning half.
- Can a sentence start with "because"?
- Yes, despite the playground rumor. "Because it rained, we stayed inside" is a complete, correct sentence; the main idea just comes second. What's incomplete is the helper half alone: "Because it rained." full stop. Our items model the correct pattern constantly.
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Aligned to Common Core L.3.1.h. Reviewed by the One More Sheet curriculum team. Content version 68, updated July 2026.