Introduction to the Passive Voice

In English, we usually start a sentence by saying who did an action. This is the Active Voice. But sometimes, what happens is more important than who did it. That is when we use the Passive Voice.

Think of it like this: in the Active Voice, the subject is the "doer." In the Passive Voice, the subject is the "receiver." This is very common in science, news reports, and formal writing when we want to sound objective or when the person doing the action is unknown or obvious.

Example:
Active: The chef cooks the food. (Focus on the chef)
Passive: The food is cooked. (Focus on the food)

The Golden Rule: The Passive Formula

To turn a sentence into the passive voice, you always need two things: the Verb to be and the Past Participle (\(V_3\)).

The Formula: Subject + Verb to Be + Past Participle (\(V_3\))

Don't worry if this seems tricky at first! The "Verb to be" changes its shape based on the tense, but the main verb always stays in the \(V_3\) form (like eaten, broken, finished, or known).

Passive Voice in Different Tenses

Based on our syllabus, we focus on five main tenses. Here is how they look in the passive voice:

1. Present Simple

Used for facts, habits, or general truths.
Form: \(am / is / are + V_3\)
Example: Rice is grown in Thailand.

2. Present Continuous

Used for actions happening right now.
Form: \(am / is / are + being + V_3\)
Example: The classroom is being cleaned by the students.

3. Present Perfect

Used for actions that happened at an unspecified time or have an effect now.
Form: \(has / have + been + V_3\)
Example: All the tickets have been sold.

4. Past Simple

Used for finished actions in the past.
Form: \(was / were + V_3\)
Example: This bridge was built in 1990.

5. Future (Will)

Used for predictions or future facts.
Form: \(will + be + V_3\)
Example: The results will be announced tomorrow.

Using Modal Verbs in Passive Voice

Modal verbs like should, ought to, must, need to, and have to are used to give advice or talk about rules. In the passive voice, we use them to show what needs to be done.

The Formula: Modal + be + \(V_3\)

  • Should / Ought to: The trash should be emptied every day. (Advice)
  • Must: Safety helmets must be worn at all times. (Strict rule)
  • Need to / Have to: The application has to be sent by Friday. (Necessity)

Quick Tip: Remember that "have to" changes to "has to" if the subject is singular (He, She, It, or a single object)!

When to use "By" (The Agent)

If you want to mention who did the action in a passive sentence, use the word by. We call this person or thing the Agent.

Example: The Harry Potter books were written by J.K. Rowling.

Did you know? You don't always need to use "by." We usually leave it out if:
1. We don't know who did it (The window was broken.)
2. It's obvious who did it (The thief was arrested. — obviously by the police!)
3. The action is more important than the person.

Step-by-Step: Turning Active into Passive

Follow these four simple steps to transform a sentence:

Active Sentence: The company (S) released (V) a new phone (O).

  1. Move the Object to the front: A new phone...
  2. Check the Tense: "released" is Past Simple.
  3. Add the correct Verb to Be: Since it's past and the phone is singular, we use "was."
  4. Add the \(V_3\) of the main verb: A new phone was released.
  5. (Optional) Add "by" + the original subject: A new phone was released by the company.

Common Mistakes to Avoid

1. Forgetting the "Verb to be"
Incorrect: The cake eaten.
Correct: The cake was eaten.

2. Using the wrong Verb to be
Incorrect: The letters is sent.
Correct: The letters are sent. (Always check if your new subject is singular or plural!)

3. Forgetting the \(V_3\) form
Incorrect: The car was steal.
Correct: The car was stolen.

Quick Review Checklist

Before you finish, check your understanding:

  • Does the sentence focus on the action rather than the person?
  • Did you include a form of the verb to be?
  • Is your main verb in the Past Participle (\(V_3\)) form?
  • If you used a modal (must/should), did you add "be" after it?

Key Takeaway: Passive Voice = Object + Be + \(V_3\). Use it to sound more professional and to keep the focus on what is happening!