give の受動態について

①Who was given this book by Kate?
疑問文を元の肯定文に戻すと、
(Mike) was given this book by Kate. と正しい文になることがわかりますので、①は文法的に正しい文です。

②Who was this book given by Kate?
疑問文を元の肯定文に戻すと、
Was this book given (who) by Kate?
This book was given (Mike) by Kate. となり、given to Mike の to が抜けていることがわかりますので、②には文法的に誤りがあります
正しくは、
This book was given to (Mike) by Kate.
Was this book given to (Mike) by Kate?
Who was this book given to by Kate? です。

③What was Jack given by Kate?
疑問文を元の肯定文に戻すと、
Was Jack given (what) by Kate?
Jack was given (this book) by Kate. と正しい文になることがわかりますので、③は文法的に正しい文です。

④What was given to Jack by Kate?
疑問文を元の肯定文に戻すと、
(This book) was given to Jack by Kate. と正しい文になることがわかりますので、④は文法的に正しい文です。