Interrogatory words are used to ask questions in English. They are also called question words because they often begin sentences that seek information. These words help gather details about various aspects of a subject, such as people, time, place, reason, method, or quantity.

Common Interrogatory Words:

1. Who – Refers to a person or subject.
   • Example: Who is coming to the party?
2. What – Refers to things or actions.
   • Example: What are you doing?
3. When – Refers to time.
   • Example: When will the meeting start?
4. Where – Refers to place or location.
   • Example: Where do you live?
5. Why – Refers to reason or purpose.
   • Example: Why are you late?
6. How – Refers to the manner, method, or condition.
   • Example: How did you solve the problem?
7. Which – Refers to a choice among options.
   • Example: Which color do you prefer?
8. Whom – Refers to the object of an action (less commonly used in modern English).
   • Example: Whom did you invite to the wedding?
9. Whose – Refers to possession.
   • Example: Whose book is this?

How to Use Interrogatory Words

1. At the Beginning of a Sentence:
   • Most interrogatory words are placed at the start of a question.
   • Example: What is your favorite food?
2. In Direct Questions:
   • They form questions to get specific information.
   • Example: Why is the sky blue?
3. In Indirect Questions:
   • They can also be used in statements that report a question.
   • Example: I want to know where he went.
4. In Exclamations (Sometimes):
   • They can also be used to express surprise or emphasis.
   • Example: What a beautiful day!

Where to Use Them

1. Everyday Conversations:
   • To gather information or clarify doubts.
   • Example: How are you doing?
2. Academic or Professional Settings:
   • To ask specific, detailed questions in discussions or research.
   • Example: What are the key findings of this study?
3. Written Communication:
   • Emails, letters, or formal requests often use interrogatory words.
   • Example: When can we expect your response?
4. Interviews and Surveys:
   • To structure questions for data collection.
   • Example: Why did you choose this career path?
5. Exams and Quizzes:
   • Often used in comprehension or problem-solving questions.
   • Example: Where does this story take place?

By using these words appropriately, you can frame clear, concise, and effective questions in both spoken and written communication.