③ I'd like you to have this book, if you haven't got one yet.
「もしよければ、この本を差し上げます」
（※すでに本を持っている可能性が大きい場合）は、
① Please use this book, if you don't have one.
② This book is for you, if you don't have one.
③ I'd like you to have this book, if you haven't got one yet.
などがオススメです^^
アメリカ合衆国 
