Every sentence is built from clauses. Knowing whether a sentence is simple, compound or complex — and what job each clause is doing — is the foundation Olympiad error-spotting questions rest on.
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A clause has its own subject and verb. How many clauses a sentence has, and how they are joined, decides its type.
📌 The three sentence types
Simple: ONE independent clause. "Riya sings well."
Compound: TWO independent clauses joined by "and/but/or/so". "Riya sings well, and she dances gracefully."
Complex: ONE independent clause + at least one dependent clause. "Riya sings well because she practises daily."
✨ Independent vs dependent
Independent clause
makes complete sense alone
She practises daily.
Dependent clause
cannot stand alone
because she practises daily
A dependent clause always does the job of a noun, an adjective, or an adverb — Olympiad papers ask you to name exactly which.
📊 Three kinds of dependent clause
| Clause type | Job it does | Example |
|---|---|---|
| Noun clause | acts as subject/object | What she said surprised everyone. |
| Adjective clause | describes a noun (uses who/which/that) | The boy who won the race is my friend. |
| Adverb clause | answers when/why/how/if | She left before the rain started. |
Olympiad trap: "That" can start a noun clause ("I know that she is right") OR an adjective clause ("The book that I bought is new"). Check what job the clause is doing, not just which word starts it.
A compound-complex sentence combines both patterns — two independent clauses AND at least one dependent clause, all in one sentence.
🏆 Breaking down a long sentence
Underline every verb first — each verb usually marks a separate clause.
Group the clauses that could stand alone — these are the independent ones.
Whatever is left, starting with who/which/that/because/if/when, is dependent.
Pro tip: A compound-complex sentence example: "Riya finished her homework, and she went outside to play because the weather was pleasant." — two independent clauses joined by "and", plus one dependent adverb clause.
12 IEO-pattern questions on sentence types and clause identification, including two Achievers-level questions.
