有些地方为什么用Youshall,不是shall只跟在第一人称后面么

Question

有些地方为什么用You shall,不是shall只跟在第一人称后面么

Answer 1

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.
你不可以再做那样的事.
He shall return that book tomorrow.
明天他必须把那本书归还.
④第一人称问句使用“shall”.
Shall I call you a taxi?
需要我替你叫一辆出租车吗?
Shall we tell her the truth?
我们可以把实情告诉她吗?
⑤问句是“Shall…?”,答句就用“shall ”；问句用“Will ”,答句就用“will ”.
Shall you go to school tomorrow?
你明天须要上学去吗?
Yes,I shall.We'll have an exam.
是的,我必须去.我们明天有考试.
Will you go to school with me tomorrow?
明天你要不要和我一道去学校?
No,I won’t.I'm going on a picnic.
我不要.我已定好要去郊游.