2.shall表示“答应”、“允诺”、“命令”、“威胁”

shall表示“答应”、“允诺”、“命令”、“威胁”等，主要用于第二、第三人称。

The law of Venice says that if anyone tries to kill or murder any citizen of Venice，everything that he owns shall be taken away from him．One half of his money and his goods shall be given to the person he has tried to kill．His life shall be at the mercy ofthe Duke．(人教大纲版高二下第68页)

威尼斯的法律规定，任何杀害或谋杀威尼斯公民的人，他所有的一切必须被没收。他的钱财的一半必须给他企图杀害的人。他的这条命全凭公爵来处理。

You shall have the book tomorrow．

你明天可以拿到书。

Don't have a finger with the matter，or you shall be punished．

不要插手这件事，要不你会受到处罚的。

You shall obey the orders．

你必须遵守规定。