请教以下几句中would用法

Why would my dad—who hadn't even stayed around long enough to see me born— talk to my mom about a summer camp?是表示意愿吗？
No one, ever, in his whole life, had written to him. Who would? He had no friends, no other relatives.这个would是表示将会吗？原型是will吗？
"That's mine!" said Harry, trying to snatch it back.
"Who'd be writing to you?" sneered Uncle Vernon, shaking the letter open with one hand and glancing at it.如果would表示将会，为什么在现在时中用 would
问：“你不认识他吗？（人已死）”答：“why would I?”这个would 觉得像should，是什么用法？

第一句，would 表示意愿

第二句，would 表示预测意义。 who would？=No one would.

第三句，would 仍是预测意义。情态动词表示预测意义时，过去式并不表示过去，只是信心程度小于现在形式而已。如He may be sleeping. He might be sleeping. 两句都是现在在推测，用might时信心小于may。

第四句的 would 还是推测意义。would 表示推测，说话人的信心在在80-90%。Why do you think I would know him? would表示推测。

曹荣禄 -

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