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You are a good person.
You are beautiful.
第三人称单数(He 或She 或 It“他、她、它”)配合is使用。
句型解析：She/He/It is +…
She is a good girl.
He is so cute.
She is my sister.
复数人称 (we /you/they“我们，你们，他们”)配合are使用。
句型解析：We /You/They are +…
We are in Class 5,Grade 7.
We are friends.
We are good students.
Be的用法口诀 ?
?我（I）是am ，你（you）是are;
is用于他（he）,她（she），它（it）; ??单数is,复数are，不要混淆记牢它; ??
a.变疑问，往前提，句末问号莫丢弃; ??b.变否定，更容易，be后not莫忘记; ? ?疑问否定任你变，句首大写莫迟疑 。
be动词的疑问句
He is a teacher.
be动词提句首
Is he a teacher?
They are twins.
be动词提句首
Are they twins?
I am a good student.
练一练
Am I a good student?
be动词的否定句
1.He is a teacher.
He is not a teacher.
2.They are twins.