In the active voice, the subject of the verb is the person or thing that does the action. In the passive, the subject (or in other words the object in the active) has the focus. The action is done to the subject in the passive..

Ex. I invite you for party. (Active voice) .
You are invited for party. (Passive voice).
Note- We can only change transitive verb into passive voice. Intransitive and linking verb can not be turned to passive voice. We form the passive by adding be + past participle..
Ex. English is spoken all over the world..
If the subject in the active voice is important as an agent, it is mentioned as by + agent in the passive voice. Ex. The college was inaugurated by the president..
When there is unknown vague or unimportant subject in the active voice, we may not repeat the subject of the active in the passive voice. Ex. Someone constructed this building in 2005. This building was constructed in 1832..
Passive of the simple present, simple past and will + the main form of the verb.

We form the passive form of the continuous forms as follows.
The present continuou – be (is / are / am) + being + the past participle..
The past continuous – be (was / were) + being + the past participle.
Ex. 1. A new college is being built in this area..
2. Cars are being repaired here..
Passive of the present perfect & past perfect.
The Present Perfect:- Have / Has + been + the past participle..
The past perfect: Had + been + the past participle..
Ex. 1. Thieves have been arrested. .
Passive with the modals .
The basic modal form in the passive voice is modal + be / have been + past participle Ex. This problem can be solved..
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Exercise (Elementary).
Complete the sentences, use the passive (present or Past) of these verbs:- .
Give, make, show, clean, damage, find invite, make, steal, take .
1. My car ___________ last week but the next day it ___________ by the police..
2. Paper ___________ from wood. 3. The injured people ___________ to hospital..
4. Many English programmes ___________ on television..
5. This film ___________ in 1965..
6. The room ___________ every day..
7. There was a fire at the hotel last week. Two of the rooms ___________..
8. This picture ___________ to me by my friend. 9. Did Jim go to wedding? No he ___________ but he didn’t go..
Exercise (Intermediate).
Change the following sentences into passive voice..
1. Someone stole my pen..
2. I cook lunch in the morning..
3. She cut the vegetables into pieces..
4. Our cook didn’t cook the food yesterday..
5. People speak English in all over the world..
6. Someone has stopped the train..
7. We must obey the law..
8. One cannot solve this mystery..
9. They are playing a match..
10. The driver was cleaning our car.