Question

I have bought some books change into passive voice​

Answer 1

Some books have been bought by me.

1) The form of the verbs which shows the "Subject of doing work" or "Work done by subject" is called.

2) In the passive voice the verb expressed as the object being acted upon.

3) The passive form of the present perfect is

Object + has/have + been + v₃ + by + subject

Answer 2

Here is the correct answer along with explanation:

Some books have been bought by me.

Explanation

When we change voice of a sentence, we have to change the active voice verb into passive voice verb or vice versa. Active-passive voice change is done strictly according to tense rules.

It is a present perfect tense.  

The active and passive voice tense forms in this tense are as follows:

Present perfect active = S+has/have + V3  +O

Present perfect passive = O+has/have + been + V3  +by+S