The meeting being held now is very important.

问题描述:

The meeting being held now is very important.
“being held ”这是什么时态?“正在被举行?”是“现在进行时的被动语态”?如果是现在进行时的被动语态,那么为什么不是“is being held”,为什么不见“be”动词?

这里是分词作定语
being held= which is being held