Change into active voice 1. The letter is written by me
2. A new film had been watched by them
3. The interesting book has been read by students
4. New vocabulary will be learnt by us

1. The letter is written by me  - I write the letter.

2. A new film had been watched by them  - They had watched a new film.

3. The interesting book has been read by students  -The students have been read the interesting book.

4. New vocabulary will be learnt by us - We will learn new a new vocabulary

Объяснение: