Переделать предложения в Активный залог.
1. When was it done? 2. Can the doctor be sent for tomorrow? 3. He will have been given detailed instructions by three p.m. 4. The chemicals are being prepared for shipment. 5. The contract hadn’t been signed by the end of June.

1when did you(he.she.we.they)do it?
2Can you send for the doctor tomorrow?
3Sam will have given him detailed instructions by three p.m.
4The workers are preparing chemicals for shipment.
5The delegations hadn't signed the contract by the end of June.
просто надо ввести в предложение действующее лицо))