Переделайте предложения в страдательный залог 1) the students speak to the famous professor. 2) they built a big plant

1. The students speak to the famous professor. The famous professor is spoken by the students.

2. They built a big plant in the city. The big plant was built by them in the city.

3. We will write a letter to our friends tomorrow. The letter will be written to our friends by us tomorrow.

4. She has already done all the exercises. All the exercises have already been done by her.