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shall和will作为助动词可以与动词原形一起构成一般将来时。例如：

I shall study harder at English.

我将更加努力地学习英语。

He will go to Shanghai.

他要去上海。

I shall not come if it rains tomorrow.

如明天下雨我就不来。

My brother will leave for the United States next week.

我的哥哥下星期要到美国去。

在过去的语法中，语法学家说shall用于第一人称，will 只用于第二、第三人称。现在，尤其是在口语中，will也常用于第一人称。

关于“shall/will”的用法的五个规则：

① 说或写都尽量使用“I'll，You'll，He'll，She'll，It'll，We'll，They'll …”的简缩形。例如：

I'll answer your question.

You'll read my blog.

He'll point out my mistake.

She'll like my essays.

It'll be a hot night for me.

We'll go to bed.

They'll wake up here.

②要表达主语的“意志”，通常都用“will”(文法上称为意志将来)。

I won't see him again.

我不愿意再和他见面。

Who will go and help that poor old man?

谁愿意去帮助那个可怜的老人?

Mary will. (玛丽愿意。)

③说话者要把自己的“意志”表达或行使出去，通常用“shall”。

You shall not do that again.