Change the following sentence into passive voice. I know him.

The correct answer is Option (1) → He is known to me.

Active to passive voice (simple present, verb "know"):

Change	Active	Passive	Why
Object becomes subject	him	He	“Him” becomes “He”.
Tense kept	know	is known	Be + past participle in the same tense: simple present “know” becomes “is known”.
Agent (to ...)	I	to me	A few verbs take a preposition other than “by”. “Know” takes “to”: “known to me”, not “known by me”.
Full sentence	I know him.	He is known to me.

Example: Everyone knows this fact. → This fact is known to everyone.

Why the Other Options are Incorrect?

Option 2: He is known by me. — Incorrect. With "know", the passive uses "to", not "by".

Option 3: He is known with me. — Incorrect. "Known with" is not used in English.

Option 4: He is known near me. — Incorrect. "Near" is a preposition of place and makes no sense here.

Contrast: most verbs take the agent with by. Know takes to (known to me, not known by me).