Her job is to teach in a school、中的is to是怎么个用法?

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Herjobistoteachinaschool、中的isto是怎么个用法?Herjobistoteachinaschool、中的isto是怎么个用法?Herjobistoteachinaschool

Her job is to teach in a school、中的is to是怎么个用法?
Her job is to teach in a school、中的is to是怎么个用法?

Her job is to teach in a school、中的is to是怎么个用法?
to teach 是一个不定式.
is是谓语动词,后面可以跟名词、动名词、短语从句或者就是这里的不定式.
这里的不定式做宾语,而非一楼说的主语.主语是her job

is是谓语,to teach是不定式作主语.