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Complex Sentences Practice

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Complex Sentences Practice

At Fire Station 6, the crew is preparing a community safety newsletter. Help Arjun, Sienna and Cooper make their messages clear by identifying and building complex sentences. A complex sentence has a main clause and a subordinate clause. Underline the subordinate clause in your answers where asked.

Spot the clauses

Read each complete sentence carefully. Look for a subordinate conjunction and check that the sentence also has a main clause.

1.Which sentence is complex?

The crew checked the hoses and packed the equipment.
Because the alarm sounded, the crew left the station.
The crew left the station quickly.

2.In “When the training drill ended, Cooper returned the helmet”, write the main clause.

3.Select both subordinating conjunctions that can introduce a reason: “The crew checked the map ___ the route had changed.”

because
although
since
while

4.In “Although the rain had stopped, the road was still slippery”, identify the subordinate clause and the conjunction that begins it.

Build clear messages

Use the clue in each question to connect ideas. Remember: when a subordinate clause comes first, place a comma between it and the main clause.

5.Combine these ideas into one complex sentence using “because”: The crew packed extra water. The afternoon was hot.

6.Complete the sentence with a main clause: “Before the open day began, …”

7.Add a subordinate clause to the main clause. Begin with “While”: “Sienna explained the smoke alarm.”

8.Choose the conjunction that best shows contrast: “___ the demonstration was brief, everyone learned an important safety tip.”

Although
Because
When

Edit and create

A good writer chooses conjunctions that show how ideas relate, then checks that every sentence is complete.

9.Fix the sentence fragment by adding a main clause: “Because Cooper spotted a loose hose.” Write a complete complex sentence.

10.Write two different complex sentences for the station newsletter: one using “if” to show a condition and one using “while” to show two things happening at the same time. Underline each subordinate clause.

11.Explain how a subordinate clause adds information to a main clause. Give one example using a fire-station newsletter sentence.

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Year 1

Complex Sentences Practice

Complex Sentences Practice

Spot the clauses

Build clear messages

Edit and create

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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