I am late for school否定句是I am not late for school系动词be 可以直接构成疑问句,否定句但为什么有这句话Don't be late for school,为什么有助动词do 构成否定句,应该是be 来构成否定句,这是为什么?

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I am late for school否定句是I am not late for school系动词be 可以直接构成疑问句,否定句但为什么有这句话Don't be late for school,为什么有助动词do 构成否定句,应该是be 来构成否定句,这是为什么?
I am late for school
否定句是I am not late for school
系动词be 可以直接构成疑问句,否定句
但为什么有这句话Don't be late for school,为什么有助动词do 构成否定句,应该是be 来构成否定句,这是为什么?

I am late for school否定句是I am not late for school系动词be 可以直接构成疑问句,否定句但为什么有这句话Don't be late for school,为什么有助动词do 构成否定句,应该是be 来构成否定句,这是为什么?
后面这句话是祈使句,动词是do,否定在动词上.

在I am not late for school中，是主系表结构，所以可以把not加在系动词后面
但是在Don't be late for school中，do 是助动词，这句话是主谓宾结构，谓语是be和late这个形容词共同做谓语，所以不可以把not加在be后面，因为在这个句子中把be late 当做一个整体来看待了...

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在I am not late for school中，是主系表结构，所以可以把not加在系动词后面
但是在Don't be late for school中，do 是助动词，这句话是主谓宾结构，谓语是be和late这个形容词共同做谓语，所以不可以把not加在be后面，因为在这个句子中把be late 当做一个整体来看待了

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Don't be late for school是起使句

I am seldom late for school.------(So/Neither am I) I am seldom late for school,是neither还是so I am late for school .the teacher is very[ ] i am late for going to school 我们知道i ma late for school i am late for work.但是有i am late for doing sth 例如 i am late for handing in my homework.i am late for going to school.我知道可以说i hand in my homework late.但是我想知 I am sorry for being late for school(对being late for school划线提问)（）are you sorry ( 指出有错误的选项：I am sorry.I am late for come to school. I am hardly ever late for school.为什么I后面要加am? I am late for school的同义句I _____ _____ to school. 根据首字母,填空.i am late for school _b______i get up late. I've got to be quick because I am late for school.的意思是 i am sorry for coming to school late 4种回答 I am always late for school为什么这里要用be动词同义句改写：I am never late for school this year 连词成句(1 )you ,spell,words,these,can .( 2 ),school,am ,I ,late ,for . I'm late for school because I get up late._____are you late for school? Yesterday I s late,so I was late for school i got up too late so i late for school i am late.please wait for me.