Subject and Object Questions

In English, when we ask questions starting with who or what, the grammatical structure of the question changes completely depending on whether we are asking about the subject (the performer of the action) or the object (the receiver of the action).

1. Subject Questions (Asking about the Subject)

A subject question asks who or what performed the action. In these questions, the question word (who or what) is the subject of the sentence.

The No-Auxiliary Rule: Do not use the helping verbs do, does, or did in subject questions. The word order remains exactly the same as in a positive statement.

Formula: Who / What + Verb (conjugated) + Object / Complement?

  • Statement: John wrote the letter.
    • Question: Who wrote the letter? (Not: Who did write the letter?)
  • Statement: An accident happened yesterday.
    • Question: What happened yesterday? (Not: What did happen yesterday?)
  • Statement: The wind broke the window.
    • Question: What broke the window?

2. Object Questions (Asking about the Object)

An object question asks who or what received the action. The subject is someone or something else, and we want to know the object.

The Auxiliary Rule: You must use the helping verbs do, does, or did (or other auxiliaries) and invert the subject and verb.

Formula: Who / What + do/does/did/auxiliary + Subject + Verb 1 + ...?

  • Statement: John met Sarah.
    • Question: Who did John meet? (We are asking about the object, Sarah).
  • Statement: He bought a new car.
    • Question: What did he buy? (We are asking about the object, a new car).
  • Statement: They want pizza.
    • Question: What do they want?

3. Side-by-Side Comparison

Let’s look at how a single situation can generate both types of questions:

Scenario: Romeo loved Juliet.

  • Asking about the Subject (Romeo):
    • Who loved Juliet? -> Romeo. (No auxiliary used; verb stays in past form).
  • Asking about the Object (Juliet):
    • Who did Romeo love? -> Juliet. (Auxiliary “did” is used; verb reverts to base form).

Next, we will explore Question Tags to learn how to add short confirmational questions to the end of positive or negative statements.