I'm afraid I won't be able to finish reading the book in two days.中为什么是won't 而不是will?

问题描述:

I'm afraid I won't be able to finish reading the book in two days.中为什么是won't 而不是will?
in two days 不是用将来式吗 为什么要用过去式?

won't 是will not 的缩写,是将来时