Convert the sentence from passive voice to active voice: The letter had been signed by the ambassador before the delegation arrived.

The ambassador signs the letter before the delegation arrives.
The ambassador had signed the letter before the delegation arrived.
The letter was being signed by the ambassador when the delegation arrived.
The ambassador will have signed the letter before the delegation arrives.

Correct answer: The ambassador had signed the letter before the delegation arrived.

Solution

The sentence is in past perfect passive voice: 'had been signed'. In active voice, the subject becomes 'the ambassador' and the verb changes to past perfect active: 'had signed'. The time clause remains unchanged.

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