Select the option that expresses the given sentence in passive voice. He has written a best-selling novel.

Correct — A. The active verb is has written — present perfect. A change of voice never changes the tense, and the present perfect passive is has/have been + past participle.

So the object, a best-selling novel, takes the subject slot and the verb becomes has been written. The original subject he turns into the agent, by him.

That is A best-selling novel has been written by him — option (a).

Why the others are wrong

• (b)
  A best-selling novel was written by him. — was written is the simple past passive. It would be the passive of He wrote a best-selling novel. The given sentence is present perfect, so the tense cannot slide back to the past.
• (c)
  A best-selling novel was being written by him — was being written is the past continuous passive and reports an action still in progress. Has written reports a finished one, and the past continuous is not in the original at all.
• (d)
  A best-selling novel would have been written by him. — would have been written is a modal perfect passive and reports something hypothetical or unfulfilled. The original states a plain fact, and there is no would in it.

Active-to-passive conversion is mechanical once you name the tense. The object moves to the front, the verb becomes the matching form of be plus the past participle, and the old subject follows by.

The part students lose marks on is the middle step, because each tense has its own form of be: is written, was written, is being written, has been written, had been written, will be written.

Here the tense is present perfect, and its passive is has/have been plus the participle. Every other option in the set is the correct passive of a sentence SSC did not print.

Key facts

• Present perfect active (has/have + V3) becomes has/have been + V3 in the passive.
• Simple past active (V2) becomes was/were + V3 in the passive.
• The passive agent is introduced by by, and it is kept whenever the doer is named in the active sentence.
• The subject pronoun he becomes the object form him after by.

Common traps

• Choosing was written because the sentence feels past. Has written is present perfect and the passive must stay present perfect.
• Dropping been. The passive of has written is has been written, never has written by him.
• Assuming the agent must disappear. The doer is named here, so by him stays.

No directly related past PYQ was found.