← 5th Grade English
English 7 U1-L9 The Sentence

Forming Compound and Complex Sentences

Every sentence in the speech is correct, and together they sound like a drumbeat. The fix is joining them, and choosing the right word to join them with.

Teacher Notes

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Lesson Goal

Students will combine two short, related sentences into a compound sentence, using a comma and and, but or or, and into a complex sentence, using a subordinating conjunction such as because, when, although, until, before or since.

Key Concepts

A compound sentence is two complete sentences joined with a comma and a coordinating conjunction. Both halves are equally important.

A complex sentence joins an independent clause, which could stand alone, to a subordinate clause, which starts with a subordinating conjunction and can't. The less important idea goes in the subordinate clause. When the subordinate clause comes first, a comma follows it.

Where Students Get Stuck

Joining sentences that don't belong together. A compound sentence claims the two halves are related, so combining two unrelated ideas only makes a longer confusing sentence.

Forgetting the comma in a compound sentence, or leaving a subordinate clause on its own, which turns it straight back into the fragment from the last lesson.

Teaching Suggestion

Have the student read the choppy draft aloud and then the revised one. The difference is easier to hear than to see, and hearing it is the reason the lesson exists.

Key Vocabulary

Compound sentence
Two complete sentences joined with a comma and and, but or or.
Complex sentence
An independent clause joined to a subordinate clause by a word like because, when or although.
Independent clause
A part of a sentence that has a subject and a predicate and could stand alone.
Subordinate clause
A part of a sentence that starts with a word like because or when and can't stand alone.
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Before You Start

The Words

The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.

Part One

The Questions

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Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.

Part Two

Vocabulary Check

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The word cards are at the top of this page. Look back at them as often as you need, then answer.

When you finish: write the answers out in your own words — not copied word for word from the choices. Saying it your own way is the part that proves you understood it. Then use Print Answer Sheet for a one-page record of what was answered and scored.
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