1. Was the window cleaned?

2. Was Ann invited to the party?

    I don't know. She should have been invited .

3. Was you seen?

    No, but I might have been seen if it hadn't been dark.

4. Has this machine been repaired?

    Well, it's working again so it must have been repaired.

5. Were those old letters thrown away?

    Yes, but it was a mistake. They shouldn't have been thrown away.

                                                                     * Chúc bạn học tốt *

1. Did anyone clean the windows?

=> Was the windows cleaned?

2. Did anyone invite Ann to the party? => Was Ann invited to the party?

    I don't know. We should have invited her. => I don't know. She should have been invited .

3.Did anyone see you? => Was you seen?

    No, but someone might have seen me if it hadn't been dark. => No, but I might have been seen if it hadn't been dark.

4.Has someone repaired this machine? => Has this machine been repaired?

    Well ,it's working again so someone must have repaired it.=>  Well, it's working again so it must have been repaired.

5. Did someone throw those old letters away. => Were those old letters thrown away?

    Yes, but it was a mistake. We shouldn't have thrown them away.=> Yes, but it was a mistake. They shouldn't have been thrown away.

cậu tham khảo nhé!