It is worth while reading the book.It would be worth his while helping the foreigner.为什么用would
问题描述：
It is worth while reading the book.It would be worth his while helping the foreigner.为什么用would
为什么一句加would,另一句不加?
答
第一句 ,这本书值得一看.讲述一个事实,不需要使用虚拟语气.
第二句使用了虚拟语气.所以用would.他花时间帮助这个外国人将是值得的.