“这本书不可能是他的”This cannot be his book.This book cannot be his.“这本书可能不是他的”This may not be his book.This book may not be his.“这本书可能是他的”。This may be his book.This book may be his.
很明显,两种翻译是指用两个主语分别造句.（可以是形式主语） 1,He can't have this computer. 2,The computer can't belong to him. 3,It's impossible that the computer is his. 4,It's impossible for him to have this computer.
