Is your brother old enough to be a member of our association?中为什么要加be?不能省略吗?

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Is your brother old enough to be a member of our association?中为什么要加be?不能省略吗?
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Is your brother old enough to be a member of our association?中为什么要加be?不能省略吗?
Is your brother old enough to be a member of our association?
中为什么要加be?不能省略吗?

Is your brother old enough to be a member of our association?中为什么要加be?不能省略吗?
to be a member ...
因为前面用了不定式,而不定式的后面是需要跟动词的.这里的动词由系动词担当.表示"作...成..为...是..."等意思,故be不可省略.

be 在这里是成为的意思,你去掉读不通的