Question

who has said this change the voice​

Answer 1

who has said this? (Active)

By whom has this been said? (Passive)

• In an active form, The subject is 'who' and the object is 'this'.
• The given active interrogation sentence is in present perfect. So the structure of passive interrogation sentence is :

Active: who + has verb + main verb + obj.

Passive: By whom + has verb + obj + been + Verb3.

By whom has this been said?

• Keep in mind its tense while converting active to passive voice or vice verse.
• Exchange the places of the subject and object.
• While converting a sentence from active to passive, we should convert the main verb into its past participle which is also known as the third form of a verb.
• We should use the word "by" in the passive sentence.

Answer 2

Answer:

Who has said this? : Change the Voice

• Voices are of two kinds and they are : Active and Passive Voices.

• The given sentence : 'Who has said this' is an Active Voice.

• It's an example of Interrogative Sentence because it is asking a question and it has a question mark (?) after it.

• So its Passive Voice is : By whom has this been said?

• The given Active Voice has been written in Present Perfect Tense because 'has' is its auxiliary verb and 'said' is main verb.

• Only 'Who' is changed to 'By whom' and 'Whom' is changed to 'Who'. This rule is always active for Present, Past and Future Tenses.

• Structure of Who based on Present Perfect Tense - Interrogative : By whom + auxiliary verb (have / has ) + subject turns into object + been + main verb's past participle form + (?) question mark.

• Here in the given sentence subject is 'this' and Predicate is 'who has made', so according to the above structure subject 'this' has turned into object : 'this'

• Example : Whom did you see? (Active) - Who was seen by you?(Passive).