The verb is acts as a copula in the sentence She is a teacher.

动词“是”在句子“她是老师”中充当系动词。

She was a teacher, and now she is a engineer.

她以前是一个老师，现在是一个工程师。

She is a writer rather than a teacher.

与其说她是老师还不如说她是作家。

What is your grandmother She is a teacher.

你的奶奶是干什么的？她是教师。

Linda once was a teacher , but now she is a secretary for a women's magazine.

林达曾经是一位教师，但是现在它是一家女性杂志社的文秘。

She is a teacher, a resource person and the quality control supervisor for the whole unit.

她既是老师, 又是提供咨询的人,还是整个单位质量管理的督导员.