Передайте в страдательном залоге.
1. The children have planted flowers in the garden.
2. The doctor will examine the child next week.
3. Mary bought a new dress last week.
4. The engineers are testing a new device.
5. We study many interesting things at school.

Ответ:

1. Flowers have been planted by the children in the garden.

2. The child will be examined by the doctor next week.

3. A new dress was bought by Mary last week.

4. A new device are being tested by the engineers.

5. Many interesting things are studied at school.