Question

change the voice (a) how do you know him? (b) i have finished my work

Answer 1

Heya
How he was known to you.
The work had been finished by me.
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Answer 2

$\huge\red{\underline{\mathfrak{Required\:Answer}}}$

(a) How is he known to you?

(b) My work has been finished.

Explanation ↴

(a) To turn active sentences beginning with 'wh-words' into passive ones, the appropriate forms of the 'be' verbs are placed after the 'wh-words'.

(b) The given sentence is in present perfect tense and we know that the passive voice form in the present perfect tense is made by putting have/has + been before the past participle form of the main verb.