Question

He will have read this book. change into passive
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Answer 1

$\huge{\mathfrak{HEYA\:MATE\:!!}}$

Answer...

This book will be read by him .

$\mathscr{\large{Hope\:helps\:}}!! \\ \\ {GRACIAS!!}$

$\huge{\red{\ddot{\smile}}}$

Answer 2

This book will have been read by him.