my grandparents have breakfast at home every morning.一般疑问句为什么加do,理由反义疑问句为什么用don‘t,理由

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mygrandparentshavebreakfastathomeeverymorning.一般疑问句为什么加do,理由反义疑问句为什么用don‘t,理由mygrandparentshavebreak

my grandparents have breakfast at home every morning.一般疑问句为什么加do,理由反义疑问句为什么用don‘t,理由
my grandparents have breakfast at home every morning.
一般疑问句为什么加do,理由
反义疑问句为什么用don‘t,理由

my grandparents have breakfast at home every morning.一般疑问句为什么加do,理由反义疑问句为什么用don‘t,理由
实义动词HAVE 作谓语一般现在时变疑问句时要加DO或DOES(第三人称单数时)
Do your grandparents have breakfast at home every morning?
反义疑问句的结构是:前肯后否,或前否后肯.这句陈述部分是肯定,故疑问部分用否定,当然要加don't
My and parents have breakfast at home every morning,don't they?
区别
He is a student.- Is he a student?
He is a student,isn't he