Question

They are going to knock down the old library. (Change the voice

Answer 1

Answer:

The old library is going to be knocked down by them.

Answer 2

Answer:

The old library is going to be knocked by them .

Explanation:

Whatever may be the Tense follow the following four rules -

1. Identify the Object by asking 'What / Whom' question to the Main Verb.
2. Begin the sentence with that object.
3. Take the Past Participle of the Main Verb.
4. Put 'by' before the Subject.

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