Question

he had written three books before 1867 in passive voice

Answer 1

$\huge\mathfrak\red{☟ \: \: answer \: \: \: \: \: \: \: ✎}$

Active : Subject + had + verb (IIIrd form) + object... Passive: Object + had + been + verb (IIIrd form) + by + subject.

So, the passive voice of the given sentence would be: Three books had been written by him before 1867.

$\sf \colorbox{gold} {\red(ANSWER ᵇʸ ⁿᵃʷᵃᵇ⁰⁰⁰⁸} \\and \\ \sf \colorbox{lightgreen} {\red♡ANSWER ᵇʸ ᶠˡⁱʳᵗʸ ᵇᵒʸ}$

Answer 2

Answer:

आप इसे पंजाबी में बिजी आपका मैं पक्का आंसर दूंगी