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.
Their promises should be kept
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
In passive voice, one possible sentence would be "the poor should not be hated".
== == "English grammer active and passive voice change from active to passive .
The hammer might have hit him to change into his passive voice.
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.
To change passive voice to active voice, identify the object of the passive sentence and make it the subject of the active sentence. Then, identify the subject of the passive sentence and make it the object of the active sentence. Finally, rewrite the sentence using the active verb form. For example, "The book was read by John" (passive) can be changed to "John read the book" (active).
The passive voice for "I have done it well" is "It has been done well" or "It was done well."
Active voice is much better than passive voice in writing.
In active voice, the subject of the sentence performs the action (e.g., "The chef cooked the meal"). In passive voice, the subject receives the action (e.g., "The meal was cooked by the chef").
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