How to Write Compound Sentences for IELTS

Want to boost your IELTS writing score? One simple trick is mastering compound sentences! Let’s break down this powerful grammar tool in an easy, engaging way.

What is a Compound Sentence?

A compound sentence combines two complete thoughts (independent clauses) using:

  • A comma + coordinating conjunction (FANBOYS)
  • Or a semi-colon

Basic Formula:
📌 Independent Clause + , + FANBOYS + Independent Clause

Example:

“IELTS writing is challenging, but practice makes perfect.”

The 3 Key Ingredients

For a perfect compound sentence, you need:

  1. Two Independent Clauses
    • Each must have:
      • Subject (Who/What)
      • Verb (Action)
      • Complete thought
    ✅ “She studies daily.” (Complete)
    ❌ “Because she studies daily.” (Incomplete)
  2. FANBOYS Conjunctions
    • For (reason)
    • And (addition)
    • Nor (negative addition)
    • But (contrast)
    • Or (choice)
    • Yet (surprise contrast)
    • So (result)
    “He wanted a high band score, so he practiced daily.”
  3. The Comma (Usually!)
    • Required before FANBOYS in compound sentences.
    • Exception: Short clauses may skip it (“I cooked and I cleaned.”).

Why Use Compound Sentences in IELTS?

  • Boosts “Grammatical Range” score (25% of writing marks!)
  • Makes writing smoother by linking related ideas
  • Sounds more natural than choppy simple sentences

IELTS Example:

“Many people prefer cities, yet rural areas offer cleaner air.”

Advanced Compound Sentences

For Band 7+ writing, try these variations:

1. Semi-Colon + Conjunctive Adverb

Formula:
📌 Independent Clause + ; + However/Therefore/Meanwhile + , + Independent Clause

“Technology has improved communication; however, it has reduced face-to-face interaction.”

2. Semi-Colon Alone (Rare!)

Only use if the connection is super obvious:
“The lights dimmed; the concert began.”

Common Mistakes to Avoid

MistakeFix
“She loves hiking, she goes every weekend.” ❌Add FANBOYS: “She loves hiking, so she goes every weekend.” ✅
“He studied hard but failed.” ❌ (Missing comma)“He studied hard, but failed.” ✅
“Because it rained, we stayed home.” ❌ (Not compound)“It rained, so we stayed home.” ✅

Pro Tips for IELTS

  • Use 2-3 compound sentences per paragraph for variety
  • Mix with simple/complex sentences for full grammar range
  • Practice with IELTS topics:
    “Urbanization has created jobs, but it has also increased pollution.”

Quick Quiz!

  1. Fix this: “I enjoy swimming I go every Sunday.”
    → “I enjoy swimming, and I go every Sunday.” ✅
  2. Which is correct?
    a) “She works hard, she deserves a break.” ❌
    b) “She works hard; she deserves a break.” ✅
  3. Add FANBOYS: “Travel broadens the mind ___ it can be expensive.”
    → “Travel broadens the mind, but it can be expensive.” ✅