Whenever someone is absent from school because of illness.中的be动词怎么理解?可以不用吗?

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Whenever someone is absent from school because of illness.中的be动词怎么理解?可以不用吗?

Whenever someone is absent from school because of illness.中的be动词怎么理解?可以不用吗?
Whenever someone is absent from school because of illness.中的be动词怎么理解?可以不用吗?

Whenever someone is absent from school because of illness.中的be动词怎么理解?可以不用吗?
这是【主系表】句型,表语absent 必须由系动词is 带出,要不然此句就没有谓语动词了

和后面的两个词组成短语,不可以不用

be absent from 固定短语

不行,be在此句中充当someone的谓语,缺少了句子就不完整。
而且 be absent from是固定搭配