Turn the sentences below to Passive Voice.

A) Roberta will take Alex to the airport.

B) The man didn't know the answer.

C) Nurses look after patients.

D) Paulo Coelho wrote the book.

E) Her parents will meet Jackie.

In english grammar, the Passive Voice differs from the Active Voice in the way the interest or the attention is given to the element of the sentene that experiences the action of the verb rather than the element that performs it.

To understand it better:

This Voice is generally used in the formal writting or when we do not want to explicity say who performed the action of the verb. As follows:

Verb TO BE correctly conjugated + main verb in past participle

However, if we want to say who performed the action (or we know it) we have to add the preposition by. As follows:

Verb 'to be' correctly conjugated + main verb in past participle + by + the subject that performed the action

Knowing this, let's change the sentences:

A) Roberta will take Alex to the airport.

Alex will be taken to the airport by Roberta

B) The man didn't know the answer.

The answer was not known by the man

C) Nurses look after patients.

Patients are looked after by the nurses

D) Paulo Coelho wrote the book.

The book was written by Paulo Coelho

E) Her parents will meet Jackie.

Jackie will be met by her parents