Introduction: Why Master Relative Clauses for TOEFL?

Welcome to one of the most important chapters in your TOEFL journey! You might be wondering, "Why do I need to learn about relative clauses?" The answer is simple: Sentence Variety. In the TOEFL Writing and Speaking sections, the examiners are looking for "syntactic variety." This means they want to see that you can use both simple and complex sentences.

If you only use short, simple sentences, your score will likely be stuck in the middle range. Relative clauses and noun modifiers allow you to pack more information into a single sentence, making your English sound academic, sophisticated, and professional. Don't worry if this seems tricky at first—once you see the patterns, it’s like putting together pieces of a puzzle!

Step 1: What is a Relative Clause?

Think of a Relative Clause as a "description box" that sits right next to a noun. Instead of using two separate sentences to describe something, we use a relative clause to join them together. This makes your writing flow better (this is called cohesion, which earns you marks in the Writing section).

The Basic Structure:
The student + [who studied every day] + passed the exam.

Did you know? In the TOEFL Writing for an Academic Discussion task, you only have 10 minutes. Using relative clauses helps you combine your ideas quickly so you can spend more time on your actual arguments!

Step 2: Choosing the Right Relative Pronoun

To build these clauses, you need a "bridge" word. Choosing the wrong one is a common mistake that can lower your Grammar Accuracy score. Here is your quick guide:

1. Who / Whom: Used for people.
2. Which: Used for things and animals.
3. That: Used for people or things (but mostly in "defining" clauses).
4. Whose: Used to show possession (his/her/their).
5. Where / When: Used for places and times.

Weak vs. Improved Examples

Weak (Simple/Repetitive): The professor is very famous. She wrote the book. The book is about biology.
Improved (Academic/Complex): The professor who wrote the biology book is very famous.

Weak (Basic): I want to live in a city. The city has good public transport.
Improved (Sophisticated): I prefer to live in a city where the public transport system is efficient.

Step 3: Defining vs. Non-Defining Clauses

This sounds technical, but it’s actually about commas. Using commas correctly shows the examiner you have high-level control over English mechanics.

Defining Clauses: These give essential information. If you remove the clause, the sentence doesn't make sense. No commas are used.
Example: The laptop that I bought yesterday is already broken. (Which laptop? The one I bought yesterday.)

Non-Defining Clauses: These give extra information. If you remove it, we still know what you are talking about. You must use commas.
Example: My MacBook, which I bought yesterday, is already broken. (We already know it's my MacBook; the date is just extra info.)

TOEFL Tip: In the Integrated Writing task, you often have to compare a reading passage and a lecture. Use non-defining clauses to introduce the authors: "The lecturer, who disagrees with the reading passage, claims that..."

Step 4: Noun Modifiers (The "Shortcuts")

Sometimes, a full relative clause is too long. To reach a higher score band, try reducing your clauses. This is a sign of a high-level (C1/C2) speaker.

1. Participle Phrases (-ing or -ed)

You can remove the relative pronoun and the verb "to be."

Full Clause: The students who are participating in the study will receive extra credit.
Reduced (Noun Modifier): The students participating in the study will receive extra credit.

2. Appositives

An appositive is a noun phrase that renames another noun right next to it. It’s a great way to add definitions to your TOEFL essays.

Weak: Methane is a greenhouse gas. It contributes to global warming.
Improved: Methane, a potent greenhouse gas, contributes significantly to global warming.

Step 5: Common Mistakes to Avoid

Avoid these "score killers" that examiners see most often:

  • Double Subjects: The man who called me he was my uncle. (Incorrect! "Who" is already the subject.)
  • Which vs. That: Never use "that" after a comma in a non-defining clause. My car, that is blue, is fast. (Wrong! Use which).
  • Relative Pronoun Omission: You can only drop "that/which/whom" if it is the object of the clause. The book [that] I read was great. (Correct). You cannot drop it if it is the subject: The man lives next door is nice. (Wrong! Must be: The man who lives...).

Quick Review Checklist

Before you finish your practice essay, ask yourself:

  • Did I use at least 2-3 relative clauses to combine short sentences?
  • Did I use "who" for people and "which/that" for things?
  • Are my commas in the right place for extra information?
  • Can I reduce a "who is" or "which is" phrase to a simple participle or appositive to show off my skills?

Key Takeaway

Relative clauses and noun modifiers are your best tools for building "academic" sentences. They help you avoid repetition, improve your flow, and demonstrate the grammatical range needed for a score of 25+ in Writing and Speaking. Start small: try to combine two sentences in your next practice task using who or which!