Active and passive voice concerns the subject of the sentence. If subject is active with respect to verbal action it is called active voice otherwise when subject seems less important than the verb it is passive voice. Now look at the following examples.
He is observing
Now you see in the first example (1) the subject (he) is actively participating in verbal action (observation) whereas in the second example (2) it seems that the observation is more important than observer and that is why there is just no hint of the observer in a sentence, hence it is passive voice. All the examples in the tenses section are the examples of active voice where subject seems important and active.
How to make passive voice
Read the following keys and you will know how to convert any sentence into passive voice.
Key No.1 (Major changes in a sentence)
While converting any sentence into passive voice following FOUR major changes are essential.
1. Convert subject into object.
Now see the following example with complete detail of the changes.
Active voice: He always creates problems.
Subject (he) is converted into object
(him) in passive voice.
Now similarly there are more examples you should read so that you may understand the changes better and try them in your practice.
Active voice: She taught us English.
Active voice: They made a bad mistake.
Key No.2 (Use of Auxiliary)
In order to understand the use of auxiliary you first need to see the tense of the sentence you want to convert into passive voice.
If sentence is indefinite tense use auxiliaries of continuous tense while converting into passive voice, like;
is, am, are with present indefinite tense
He reads an interesting novel. (present
You troubled us. (past indefinite)
We shall give you surprise. (future indefinite)
If sentence is of continuous tense use auxiliaries of the same tense by adding “being” with it.
He is chasing you. (present continuous)
She was knocking at the door. (past continuous)
Note: Future continuous tense cannot be converted into passive voice because you cannot use will be being or shall be being.
If sentence is in perfect tense use auxiliaries of the same tense by adding “been” with it.
He has learnt French in a month. (present
They hadn’t attended the church
this Sunday. (past perfect)
Brown will have bought a new car. (future
Tenses that cannot be converted into passive
There are FOUR tenses that cannot be converted into passive voice as mentioned below.
perfect continuous tense