A10
core
Scene core
Events
Identity / Classification
What is it? Who is who?
basic
Copular clause
Predicate nominal
Classification
含义
A relation that identifies, names, classifies, or equates one participant with another role, class, or label.
如何识别
Ask whether the sentence says that X is Y or belongs to a class.
示例
单词
doctor|teacher|friend|problem
短语
my brother is a doctor|this is a mistake
句子
She is a doctor.
Visual guide
Basic shape
Identity/class frame: X = Y She = a doctor person = class/role Meaning: X belongs to Y
Compare shape
Same link, different marking: [She] [is] [a doctor] [She] [doctor] zero BE [She] [doctor-CASE] Marking changes; X = Y stays.
语言视角
用母语深入讲解
中文
显性程度
strong
重要程度
Identity and classification commonly use 是 shì, while many property descriptions do not use 是.
她是医生。
tā shì yīshēng = she is doctor
在所学语言中
英语
显性程度
strong
学习难度
英语表示身份或类别时通常用 be；单数可数名词前常要加冠词，如 a doctor。
She is a doctor.
is a doctor = 身份/分类（她属于医生这一类）
常见易错点
学习者可能说 She doctor，或在 She is a doctor 中漏掉 a。
Same block, different coding
Both languages use this block strongly, but they signal it differently. Focus on form changes, not only meaning.