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?

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.