Какие существуют видоизменения корней? какие функции они выполняют,

Измените предложения в страдательный залог и переведите образованные предложения

Example: He will spend money on disks. – The money will be spent on disks. Деньги будут потрачены на диски.

1. They will sell the books soon.

2. Alex sends money to his mother every month.

3. The doctor is looking after sick patients.

4. Charles Babbage invented the first computer in 1823.

5. The mother was looking for her son from 2 till 4 o’clock .

6. They had written a test when I came.

7. Father promised Natalie a new car.

8. They have offered her an interesting trip