be动词和do⼀does的区别！

be动词是在句子无动词下充当动词的，而do does则是在句子中有动词时，当助动词用

前者为系动词，可与形容词、名词、代词构成系表结构，be 直接加not 构成否定，变成疑问句时直接将其调至句首。
如：She is a teacher. --- She is not a teacher.---Is she a teacher? Who is she?
而后者作为助动词，不单独作为句子成分，而是与行为动词搭配完成否定或疑问。
如：She teaches(行为动词) English. She doesn't teach Chinese. Does she teach Chinese? What does she teach? 如该主语为复数或第二人称，则does应改为do。
They teach English. They don't teach Chinese. Do they ... What do they...

be其实就是am is are，do(dose)也就是所有动词的原形，do后面通常接名词．eg:do sports,do homework.而be动词后面通常接形容词，表示某人（物）怎么样！For example:The girl is very smart.

do/dose是助动词