Adjective Clauses: Rules for Using 'Who,' 'Which,' and 'That' in High School English

📚 Adjective Clauses: Your Comprehensive Guide

Adjective clauses, also known as relative clauses, are essential for adding detail and complexity to your writing. They function as adjectives, modifying nouns or pronouns. Understanding when to use 'who,' 'which,' and 'that' can significantly improve your grammar and clarity. Let's dive in!

📜 History and Background

The use of relative pronouns to introduce dependent clauses dates back to Old English. Over centuries, these structures evolved, becoming more refined and governed by specific rules. Recognizing the historical development helps understand why these rules exist.

🔑 Key Principles

• 👤 'Who': Used to refer to people.
• 🐶 'Which': Used to refer to things or animals.
• 🌐 'That': Can refer to people, things, or animals, but its usage is more restrictive.

🆚 Who vs. That (for People)

While both can refer to people, 'who' is generally preferred in nonrestrictive clauses (clauses that add extra, non-essential information and are set off by commas). 'That' is typically used in restrictive clauses (clauses that are essential to the meaning of the sentence and are *not* set off by commas).

Restrictive Clause: The student that studies diligently will succeed. (Essential information – identifies *which* student)

Nonrestrictive Clause: Mary, who studies diligently, will succeed. (Extra information – provides additional detail about Mary)

🆚 Which vs. That (for Things)

Similar to the 'who' vs. 'that' rule, 'which' is generally used for nonrestrictive clauses, while 'that' is used for restrictive clauses.

Restrictive Clause: The car that I bought is red. (Essential information – identifies *which* car)

Nonrestrictive Clause: My car, which I bought last year, is red. (Extra information – provides additional detail about my car)

📝 Real-World Examples

• 👨‍🏫 The teacher who taught the class was very knowledgeable.
• 🐕 The dog that barked all night kept the neighbors awake.
• 🍎 The apple, which was juicy and red, tasted delicious.
• 🏠 The house that Jack built is now for sale.
• 👩‍⚕️ The doctor, who is a specialist, examined the patient carefully.
• 📚 The book that I borrowed from the library is overdue.

💡 Tips and Tricks

• ✍️ When in doubt, use 'who' for people and 'which' for things in nonrestrictive clauses.
• ✅ In restrictive clauses, 'that' is often a safe choice, but consider if 'who' or 'which' might be clearer.
• 🧐 Pay attention to commas! Their presence often indicates a nonrestrictive clause.

✍️ Practice Quiz

Choose the correct relative pronoun ('who,' 'which,' or 'that') for each sentence:

1. The movie _____ I watched last night was amazing.
2. The woman _____ lives next door is a doctor.
3. My phone, _____ is brand new, already has a cracked screen.
4. The book _____ I ordered online arrived today.
5. The student _____ answered the question correctly received extra credit.
6. This is the cake _____ my mom made.

🎓 Conclusion

Mastering adjective clauses and the correct usage of 'who,' 'which,' and 'that' enhances your writing skills and allows you to express yourself with greater precision. Keep practicing, and you'll become a grammar pro in no time!