Convert the sentence provided below from its passive voice structure to an active voice structure: The road was blocked by the fallen tree.

Correct — A. The passive verb was blocked is simple past: was + past participle.

Its active form is the simple past too: blocked.

The doer in the by-phrase, the fallen tree, becomes the subject, and the road becomes the object: "The fallen tree blocked the road" → option (a).

Why the others are wrong

• (b)
  The fallen tree had blocked the road. — had blocked is past perfect. Was blocked is simple past, so its active is plain blocked, and had adds an earlier-past layer the original never had.
• (c)
  The road blocks the tree. — The road blocks the tree swaps the doer and the receiver and moves the tense to the present. It no longer describes the same event.
• (d)
  The road had been blocked by the tree. — had been blocked is still passive, so nothing has been converted. It also shifts to the past perfect and drops the word fallen.

Voice change moves the roles, not the time. The doer named in the by-phrase becomes the active subject, and the passive subject becomes the object.

The tense stays put: was + past participle maps to the simple past. Likewise is done → does, is being done → is doing, has been done → has done.

Key facts

• Simple past passive: was/were + past participle (was blocked).
• Simple past active: the past form of the verb (blocked).
• A voice change keeps the tense and the details: the fallen tree stays the fallen tree.

Common traps

• Choosing had blocked because the blocking sounds finished
• Picking (d) because it keeps the road first, when that sentence is still passive

No directly related past PYQ was found.