"Shall"与"will"的区别???

助动词shall和will的用法
shall，should
A)表示应该：I should come here early and sorry for keeping you waiting so long.
区别shall表示“愿意按对方指示做”，而may, might, can表示“征求对方同意”
Shall I come in? (你要我进来吗？) May I come in? (我可以进来吗？)
will/would：shall/should强调说话人认为应不应该，will/would是句子主语愿不愿意
e.g. I kicked the door as hard as I could but it __A__ open.
A) wouldn’t B) shouldn’t C) couldn’t D) mustn’t
解释：我使劲踢门，门就是不开。B是应不应该，我如果认为门不该开，还踢它干吗？couldn’t不能，门不能被打开要用被动。Mustn’t 禁止(must表猜测只用于肯定句)，也应用被动。只有would表示门拟人化后似乎有了自己的意愿，就是不开。
I would have come, but my boss kept me. (说明我本来想来，意愿)
B)不太会发生的情况发生了，万一, 居然, 竟然, 表示惊讶、意外
Should anybody come for me, please tell him I am in Room 308. (万一有人找我, …)
I never expected that a man should cry like that.
Who _C_ to meet us but the manager! A) is coming B) will come C) should come D) has come
C)表示随时可能，或即将发生：Hurry up. The president should be here at any time.
D)用于建议性从句中表示虚拟，而且省略should较好
E)Shall第二、三人称，重读