Sentence Lab

SentenceLab ✦

Chapter 3 — Sentence Variety

Master Complex
Sentences

An interactive classroom companion for identifying, combining, and writing complex sentences with subordinating conjunctions.

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Learn the Rules

Definition, dependent words, and clear examples.

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Identification Quiz

10 sentences — spot which ones are complex.

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Sentence Combiner

Pick a conjunction and merge two sentences into one.

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Story Builder

Write a 5–7 sentence story using complex sentences.

What is a Complex Sentence?

A complex sentence has one independent clause and one or more dependent clauses. The dependent clause cannot stand alone — it needs the independent clause. They are joined by a subordinating conjunction.

Formula

[ Dependent clause ] , [ Independent clause ]

— OR —

[ Independent clause ] [ dependent clause ]

Common Subordinating Conjunctions

These words introduce a dependent clause:

whenwhilebecause althoughsinceafter beforeifunless untileven thoughas soon as whereverso thatonce whereasthoughas if

Examples

✅ Complex sentence

When I got a credit card, I began spending money carelessly.

✅ Complex sentence

She stayed inside because it was raining heavily.

❌ Simple sentence

She stayed inside.

❌ Compound sentence

She stayed inside, and he went out.

🔗 Sentence Combination

Choose a subordinating conjunction, then write a combined complex sentence.

✍️ Story Builder

Write 5–7 complex sentences. Each must use a subordinating conjunction.

Choose a theme:

🏔️ Adventure

🤝 Friendship

🔍 Mystery

🏫 School Life

🌿 Nature

💻 Technology

Your Story