Promises should be kept.
If you want to you can add by one. But this is not necessary.
Using 'one' is a bit formal it would be better to use 'people'.
Promises should be kept by people.
Active voice is much better than passive voice in writing.
He teaches us english- change the voice
This sentence can't be changed into a passive voice.
you
change into active voice this essay was written by him
You can't: there is no passive form of this verb--just as there is no passive form of the verb "to go". Why? Because in order to have a passive voice, the verb in question must be transitive: i.e., take an object. You can't should a thing, or go a thing. But you can, for instance, stroke a thing. So you can say that the thing is/was stroked--passive.
Can it be changed into passive voice?
In passive voice, one possible sentence would be "the poor should not be hated".
The hammer might have hit him to change into his passive voice.
A noise should not be made.
"Will you marry me" can be changed to passive voice as "Will I be married by you." In the passive voice sentence, the subject of the active voice becomes the object of the passive voice, and the object of the active voice becomes the subject of the passive voice.
== == "English grammer active and passive voice change from active to passive .
Active voice is much better than passive voice in writing.
He teaches us english- change the voice
Passive is to change as active is to act. In passive voice, the subject of the sentence receives the action, while in active voice, the subject performs the action.
This sentence can't be changed into a passive voice.
This sentence is in passive voice. To change it to active voice, you could say "Five dollars were present."