Jawaban:

1. The documents are printed.

2. The window is opened.

3. The litter is thrown away.

4. The singa aren't sung.

5. The food isn't eaten.

1. The test was written.

2. The lights were switched on.

3. Dinner was served.

4. This computer wasn't sold.

5. The children weren't picked up.

1. The postcard has been sent.

2. The pencils have been counted.

3. The money has been spent.

4. The room hasn't been booked.

5. The people hasn't been informed.

Penjelasan:

Rumus passive:

Present simple:

object + am/is/are + verb 3

Past simple:

object + was/were + verb 3

Present perfect:

object + have/has + been + verb 3

I hope it helps you!